Finding the Fourth Proportional to 156,780.42, 216,357.39 and 85,159.86

Step by Step Solution

1. Step 1: Write the proportion equation
   156,780.42 : 216,357.39 = 85,159.86 : x
2. Step 2: Convert to fraction form
   156,780.42/216,357.39 = 85,159.86/x
3. Step 3: Cross multiply
   156,780.42x = 216,357.39 × 85,159.86
4. Step 4: Simplify right side
   156,780.42x = 18,424,965,042.37
5. Step 5: Solve for x
   x = 18,424,965,042.37/156,780.42
6. Step 6: Final answer
   x = 117,520.83