Finding the Fourth Proportional to 156,107.72, 215,431.98 and 88,111.64

Step by Step Solution

1. Step 1: Write the proportion equation
   156,107.72 : 215,431.98 = 88,111.64 : x
2. Step 2: Convert to fraction form
   156,107.72/215,431.98 = 88,111.64/x
3. Step 3: Cross multiply
   156,107.72x = 215,431.98 × 88,111.64
4. Step 4: Simplify right side
   156,107.72x = 18,982,065,066.25
5. Step 5: Solve for x
   x = 18,982,065,066.25/156,107.72
6. Step 6: Final answer
   x = 121,595.94