Finding the Fourth Proportional to 156,134.50, 215,494.80 and 89,066.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,134.50 : 215,494.80 = 89,066.50 : x
2. Step 2: Convert to fraction form
   156,134.50/215,494.80 = 89,066.50/x
3. Step 3: Cross multiply
   156,134.50x = 215,494.80 × 89,066.50
4. Step 4: Simplify right side
   156,134.50x = 19,193,367,604.20
5. Step 5: Solve for x
   x = 19,193,367,604.20/156,134.50
6. Step 6: Final answer
   x = 122,928.42