Finding the Fourth Proportional to 156,304.79, 215,709.71 and 88,320

Step by Step Solution

1. Step 1: Write the proportion equation
   156,304.79 : 215,709.71 = 88,320 : x
2. Step 2: Convert to fraction form
   156,304.79/215,709.71 = 88,320/x
3. Step 3: Cross multiply
   156,304.79x = 215,709.71 × 88,320
4. Step 4: Simplify right side
   156,304.79x = 19,051,481,145.60
5. Step 5: Solve for x
   x = 19,051,481,145.60/156,304.79
6. Step 6: Final answer
   x = 121,886.74