Finding the Fourth Proportional to 156,870.76, 216,483.02 and 85,250.78

Step by Step Solution

1. Step 1: Write the proportion equation
   156,870.76 : 216,483.02 = 85,250.78 : x
2. Step 2: Convert to fraction form
   156,870.76/216,483.02 = 85,250.78/x
3. Step 3: Cross multiply
   156,870.76x = 216,483.02 × 85,250.78
4. Step 4: Simplify right side
   156,870.76x = 18,455,346,311.76
5. Step 5: Solve for x
   x = 18,455,346,311.76/156,870.76
6. Step 6: Final answer
   x = 117,646.82