Finding the Fourth Proportional to 145,143.83, 217,729.48 and 56,404.17

Step by Step Solution

1. Step 1: Write the proportion equation
   145,143.83 : 217,729.48 = 56,404.17 : x
2. Step 2: Convert to fraction form
   145,143.83/217,729.48 = 56,404.17/x
3. Step 3: Cross multiply
   145,143.83x = 217,729.48 × 56,404.17
4. Step 4: Simplify right side
   145,143.83x = 12,280,851,007.24
5. Step 5: Solve for x
   x = 12,280,851,007.24/145,143.83
6. Step 6: Final answer
   x = 84,611.60