Finding the Fourth Proportional to 56,635.42, 78,157.17 and 31,143.42

Step by Step Solution

1. Step 1: Write the proportion equation
   56,635.42 : 78,157.17 = 31,143.42 : x
2. Step 2: Convert to fraction form
   56,635.42/78,157.17 = 31,143.42/x
3. Step 3: Cross multiply
   56,635.42x = 78,157.17 × 31,143.42
4. Step 4: Simplify right side
   56,635.42x = 2,434,081,571.32
5. Step 5: Solve for x
   x = 2,434,081,571.32/56,635.42
6. Step 6: Final answer
   x = 42,978.08