Finding the Fourth Proportional to 81,541.78, 112,479.87 and 51,279.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,541.78 : 112,479.87 = 51,279.10 : x
2. Step 2: Convert to fraction form
   81,541.78/112,479.87 = 51,279.10/x
3. Step 3: Cross multiply
   81,541.78x = 112,479.87 × 51,279.10
4. Step 4: Simplify right side
   81,541.78x = 5,767,866,501.72
5. Step 5: Solve for x
   x = 5,767,866,501.72/81,541.78
6. Step 6: Final answer
   x = 70,735.11