Finding the Fourth Proportional to 151,139.58, 208,550.61 and 90,697.38

Step by Step Solution

1. Step 1: Write the proportion equation
   151,139.58 : 208,550.61 = 90,697.38 : x
2. Step 2: Convert to fraction form
   151,139.58/208,550.61 = 90,697.38/x
3. Step 3: Cross multiply
   151,139.58x = 208,550.61 × 90,697.38
4. Step 4: Simplify right side
   151,139.58x = 18,914,993,924.40
5. Step 5: Solve for x
   x = 18,914,993,924.40/151,139.58
6. Step 6: Final answer
   x = 125,149.18