Finding the Fourth Proportional to 151,134.06, 208,541.91 and 90,691.50

Step by Step Solution

1. Step 1: Write the proportion equation
   151,134.06 : 208,541.91 = 90,691.50 : x
2. Step 2: Convert to fraction form
   151,134.06/208,541.91 = 90,691.50/x
3. Step 3: Cross multiply
   151,134.06x = 208,541.91 × 90,691.50
4. Step 4: Simplify right side
   151,134.06x = 18,912,978,630.77
5. Step 5: Solve for x
   x = 18,912,978,630.77/151,134.06
6. Step 6: Final answer
   x = 125,140.41