Finding the Fourth Proportional to 81,256.42, 112,139.60 and 45,449.78

Step by Step Solution

1. Step 1: Write the proportion equation
   81,256.42 : 112,139.60 = 45,449.78 : x
2. Step 2: Convert to fraction form
   81,256.42/112,139.60 = 45,449.78/x
3. Step 3: Cross multiply
   81,256.42x = 112,139.60 × 45,449.78
4. Step 4: Simplify right side
   81,256.42x = 5,096,720,149.29
5. Step 5: Solve for x
   x = 5,096,720,149.29/81,256.42
6. Step 6: Final answer
   x = 62,723.91