Finding the Fourth Proportional to 156,137.50, 215,498.94 and 89,069.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,137.50 : 215,498.94 = 89,069.50 : x
2. Step 2: Convert to fraction form
   156,137.50/215,498.94 = 89,069.50/x
3. Step 3: Cross multiply
   156,137.50x = 215,498.94 × 89,069.50
4. Step 4: Simplify right side
   156,137.50x = 19,194,382,836.33
5. Step 5: Solve for x
   x = 19,194,382,836.33/156,137.50
6. Step 6: Final answer
   x = 122,932.56