Finding the Fourth Proportional to 156,639, 216,174.78 and 89,583.96

Step by Step Solution

1. Step 1: Write the proportion equation
   156,639 : 216,174.78 = 89,583.96 : x
2. Step 2: Convert to fraction form
   156,639/216,174.78 = 89,583.96/x
3. Step 3: Cross multiply
   156,639x = 216,174.78 × 89,583.96
4. Step 4: Simplify right side
   156,639x = 19,365,792,844.53
5. Step 5: Solve for x
   x = 19,365,792,844.53/156,639
6. Step 6: Final answer
   x = 123,633.28