Finding the Fourth Proportional to 156,440.89, 215,887.12 and 88,471.21

Step by Step Solution

1. Step 1: Write the proportion equation
   156,440.89 : 215,887.12 = 88,471.21 : x
2. Step 2: Convert to fraction form
   156,440.89/215,887.12 = 88,471.21/x
3. Step 3: Cross multiply
   156,440.89x = 215,887.12 × 88,471.21
4. Step 4: Simplify right side
   156,440.89x = 19,099,794,015.35
5. Step 5: Solve for x
   x = 19,099,794,015.35/156,440.89
6. Step 6: Final answer
   x = 122,089.53