Finding the Fourth Proportional to 156,105.57, 215,425.28 and 84,485.57

Step by Step Solution

1. Step 1: Write the proportion equation
   156,105.57 : 215,425.28 = 84,485.57 : x
2. Step 2: Convert to fraction form
   156,105.57/215,425.28 = 84,485.57/x
3. Step 3: Cross multiply
   156,105.57x = 215,425.28 × 84,485.57
4. Step 4: Simplify right side
   156,105.57x = 18,200,326,073.66
5. Step 5: Solve for x
   x = 18,200,326,073.66/156,105.57
6. Step 6: Final answer
   x = 116,589.86