Finding the Fourth Proportional to 1,391,300.42, 1,919,990.31 and 771,145.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,300.42 : 1,919,990.31 = 771,145.17 : x
2. Step 2: Convert to fraction form
   1,391,300.42/1,919,990.31 = 771,145.17/x
3. Step 3: Cross multiply
   1,391,300.42x = 1,919,990.31 × 771,145.17
4. Step 4: Simplify right side
   1,391,300.42x = 1,480,591,254,003.30
5. Step 5: Solve for x
   x = 1,480,591,254,003.30/1,391,300.42
6. Step 6: Final answer
   x = 1,064,177.97