Finding the Fourth Proportional to 156,135.50, 215,496.18 and 89,067.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,135.50 : 215,496.18 = 89,067.50 : x
2. Step 2: Convert to fraction form
   156,135.50/215,496.18 = 89,067.50/x
3. Step 3: Cross multiply
   156,135.50x = 215,496.18 × 89,067.50
4. Step 4: Simplify right side
   156,135.50x = 19,193,706,012.15
5. Step 5: Solve for x
   x = 19,193,706,012.15/156,135.50
6. Step 6: Final answer
   x = 122,929.80