Finding the Fourth Proportional to 156,611.29, 216,123.72 and 84,991.31

Step by Step Solution

1. Step 1: Write the proportion equation
   156,611.29 : 216,123.72 = 84,991.31 : x
2. Step 2: Convert to fraction form
   156,611.29/216,123.72 = 84,991.31/x
3. Step 3: Cross multiply
   156,611.29x = 216,123.72 × 84,991.31
4. Step 4: Simplify right side
   156,611.29x = 18,368,638,084.87
5. Step 5: Solve for x
   x = 18,368,638,084.87/156,611.29
6. Step 6: Final answer
   x = 117,288.08