Finding the Fourth Proportional to 156,990.72, 216,649.98 and 85,370.52

Step by Step Solution

1. Step 1: Write the proportion equation
   156,990.72 : 216,649.98 = 85,370.52 : x
2. Step 2: Convert to fraction form
   156,990.72/216,649.98 = 85,370.52/x
3. Step 3: Cross multiply
   156,990.72x = 216,649.98 × 85,370.52
4. Step 4: Simplify right side
   156,990.72x = 18,495,521,450.59
5. Step 5: Solve for x
   x = 18,495,521,450.59/156,990.72
6. Step 6: Final answer
   x = 117,812.83