Finding the Fourth Proportional to 145,168.50, 217,766.49 and 56,428.86

Step by Step Solution

1. Step 1: Write the proportion equation
   145,168.50 : 217,766.49 = 56,428.86 : x
2. Step 2: Convert to fraction form
   145,168.50/217,766.49 = 56,428.86/x
3. Step 3: Cross multiply
   145,168.50x = 217,766.49 × 56,428.86
4. Step 4: Simplify right side
   145,168.50x = 12,288,314,776.90
5. Step 5: Solve for x
   x = 12,288,314,776.90/145,168.50
6. Step 6: Final answer
   x = 84,648.63