Finding the Fourth Proportional to 156,105.61, 215,425.74 and 84,485.63

Step by Step Solution

1. Step 1: Write the proportion equation
   156,105.61 : 215,425.74 = 84,485.63 : x
2. Step 2: Convert to fraction form
   156,105.61/215,425.74 = 84,485.63/x
3. Step 3: Cross multiply
   156,105.61x = 215,425.74 × 84,485.63
4. Step 4: Simplify right side
   156,105.61x = 18,200,380,217.50
5. Step 5: Solve for x
   x = 18,200,380,217.50/156,105.61
6. Step 6: Final answer
   x = 116,590.17