Finding the Fourth Proportional to 298,385,057.50, 408,789,010.51 and 287,201,737.98

Step by Step Solution

1. Step 1: Write the proportion equation
   298,385,057.50 : 408,789,010.51 = 287,201,737.98 : x
2. Step 2: Convert to fraction form
   298,385,057.50/408,789,010.51 = 287,201,737.98/x
3. Step 3: Cross multiply
   298,385,057.50x = 408,789,010.51 × 287,201,737.98
4. Step 4: Simplify right side
   298,385,057.50x = 117,404,914,285,596,496
5. Step 5: Solve for x
   x = 117,404,914,285,596,496/298,385,057.50
6. Step 6: Final answer
   x = 393,467,807.23