Finding the Fourth Proportional to 156,870.25, 216,484.17 and 85,254.91

Step by Step Solution

1. Step 1: Write the proportion equation
   156,870.25 : 216,484.17 = 85,254.91 : x
2. Step 2: Convert to fraction form
   156,870.25/216,484.17 = 85,254.91/x
3. Step 3: Cross multiply
   156,870.25x = 216,484.17 × 85,254.91
4. Step 4: Simplify right side
   156,870.25x = 18,456,338,429.77
5. Step 5: Solve for x
   x = 18,456,338,429.77/156,870.25
6. Step 6: Final answer
   x = 117,653.53