Finding the Fourth Proportional to 78,700.56, 108,575.76 and 51,857.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,700.56 : 108,575.76 = 51,857.28 : x
2. Step 2: Convert to fraction form
   78,700.56/108,575.76 = 51,857.28/x
3. Step 3: Cross multiply
   78,700.56x = 108,575.76 × 51,857.28
4. Step 4: Simplify right side
   78,700.56x = 5,630,443,587.53
5. Step 5: Solve for x
   x = 5,630,443,587.53/78,700.56
6. Step 6: Final answer
   x = 71,542.61