Finding the Fourth Proportional to 2,585,386,514.86, 3,878,624,499.78 and 838,453,035.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,585,386,514.86 : 3,878,624,499.78 = 838,453,035.67 : x
2. Step 2: Convert to fraction form
   2,585,386,514.86/3,878,624,499.78 = 838,453,035.67/x
3. Step 3: Cross multiply
   2,585,386,514.86x = 3,878,624,499.78 × 838,453,035.67
4. Step 4: Simplify right side
   2,585,386,514.86x = 3,252,044,486,064,576,512
5. Step 5: Solve for x
   x = 3,252,044,486,064,576,512/2,585,386,514.86
6. Step 6: Final answer
   x = 1,257,856,211.20