Finding the Fourth Proportional to 298,128.78, 447,196.41 and 87,770.70

Step by Step Solution

1. Step 1: Write the proportion equation
   298,128.78 : 447,196.41 = 87,770.70 : x
2. Step 2: Convert to fraction form
   298,128.78/447,196.41 = 87,770.70/x
3. Step 3: Cross multiply
   298,128.78x = 447,196.41 × 87,770.70
4. Step 4: Simplify right side
   298,128.78x = 39,250,741,943.19
5. Step 5: Solve for x
   x = 39,250,741,943.19/298,128.78
6. Step 6: Final answer
   x = 131,657.00