Finding the Fourth Proportional to 131,131.78, 180,864.98 and 90,308.87

Step by Step Solution

1. Step 1: Write the proportion equation
   131,131.78 : 180,864.98 = 90,308.87 : x
2. Step 2: Convert to fraction form
   131,131.78/180,864.98 = 90,308.87/x
3. Step 3: Cross multiply
   131,131.78x = 180,864.98 × 90,308.87
4. Step 4: Simplify right side
   131,131.78x = 16,333,711,062.05
5. Step 5: Solve for x
   x = 16,333,711,062.05/131,131.78
6. Step 6: Final answer
   x = 124,559.52