Finding the Fourth Proportional to 156,605.81, 216,116.15 and 84,985.83

Step by Step Solution

1. Step 1: Write the proportion equation
   156,605.81 : 216,116.15 = 84,985.83 : x
2. Step 2: Convert to fraction form
   156,605.81/216,116.15 = 84,985.83/x
3. Step 3: Cross multiply
   156,605.81x = 216,116.15 × 84,985.83
4. Step 4: Simplify right side
   156,605.81x = 18,366,810,384.15
5. Step 5: Solve for x
   x = 18,366,810,384.15/156,605.81
6. Step 6: Final answer
   x = 117,280.52