Finding the Fourth Proportional to 151,391.31, 208,909.98 and 90,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   151,391.31 : 208,909.98 = 90,964.50 : x
2. Step 2: Convert to fraction form
   151,391.31/208,909.98 = 90,964.50/x
3. Step 3: Cross multiply
   151,391.31x = 208,909.98 × 90,964.50
4. Step 4: Simplify right side
   151,391.31x = 19,003,391,875.71
5. Step 5: Solve for x
   x = 19,003,391,875.71/151,391.31
6. Step 6: Final answer
   x = 125,524.98