Finding the Fourth Proportional to 56,808.72, 78,399.48 and 31,658.16

Step by Step Solution

1. Step 1: Write the proportion equation
   56,808.72 : 78,399.48 = 31,658.16 : x
2. Step 2: Convert to fraction form
   56,808.72/78,399.48 = 31,658.16/x
3. Step 3: Cross multiply
   56,808.72x = 78,399.48 × 31,658.16
4. Step 4: Simplify right side
   56,808.72x = 2,481,983,281.76
5. Step 5: Solve for x
   x = 2,481,983,281.76/56,808.72
6. Step 6: Final answer
   x = 43,690.18