Finding the Fourth Proportional to 156,815.48, 216,404.20 and 85,196.09

Step by Step Solution

1. Step 1: Write the proportion equation
   156,815.48 : 216,404.20 = 85,196.09 : x
2. Step 2: Convert to fraction form
   156,815.48/216,404.20 = 85,196.09/x
3. Step 3: Cross multiply
   156,815.48x = 216,404.20 × 85,196.09
4. Step 4: Simplify right side
   156,815.48x = 18,436,790,404.57
5. Step 5: Solve for x
   x = 18,436,790,404.57/156,815.48
6. Step 6: Final answer
   x = 117,569.97