Finding the Fourth Proportional to 156,481.32, 215,940.42 and 89,409

Step by Step Solution

1. Step 1: Write the proportion equation
   156,481.32 : 215,940.42 = 89,409 : x
2. Step 2: Convert to fraction form
   156,481.32/215,940.42 = 89,409/x
3. Step 3: Cross multiply
   156,481.32x = 215,940.42 × 89,409
4. Step 4: Simplify right side
   156,481.32x = 19,307,017,011.78
5. Step 5: Solve for x
   x = 19,307,017,011.78/156,481.32
6. Step 6: Final answer
   x = 123,382.25