Finding the Fourth Proportional to 156,196.72, 215,555.16 and 89,134.96

Step by Step Solution

1. Step 1: Write the proportion equation
   156,196.72 : 215,555.16 = 89,134.96 : x
2. Step 2: Convert to fraction form
   156,196.72/215,555.16 = 89,134.96/x
3. Step 3: Cross multiply
   156,196.72x = 215,555.16 × 89,134.96
4. Step 4: Simplify right side
   156,196.72x = 19,213,500,564.39
5. Step 5: Solve for x
   x = 19,213,500,564.39/156,196.72
6. Step 6: Final answer
   x = 123,008.35