Finding the Fourth Proportional to 156,477.32, 215,934.90 and 89,405

Step by Step Solution

1. Step 1: Write the proportion equation
   156,477.32 : 215,934.90 = 89,405 : x
2. Step 2: Convert to fraction form
   156,477.32/215,934.90 = 89,405/x
3. Step 3: Cross multiply
   156,477.32x = 215,934.90 × 89,405
4. Step 4: Simplify right side
   156,477.32x = 19,305,659,734.50
5. Step 5: Solve for x
   x = 19,305,659,734.50/156,477.32
6. Step 6: Final answer
   x = 123,376.73