Finding the Fourth Proportional to 156,081.15, 215,401.75 and 88,109.64

Step by Step Solution

1. Step 1: Write the proportion equation
   156,081.15 : 215,401.75 = 88,109.64 : x
2. Step 2: Convert to fraction form
   156,081.15/215,401.75 = 88,109.64/x
3. Step 3: Cross multiply
   156,081.15x = 215,401.75 × 88,109.64
4. Step 4: Simplify right side
   156,081.15x = 18,978,970,647.87
5. Step 5: Solve for x
   x = 18,978,970,647.87/156,081.15
6. Step 6: Final answer
   x = 121,596.81