Finding the Fourth Proportional to 81,018.40, 121,488.72 and 41,555.20

Step by Step Solution

1. Step 1: Write the proportion equation
   81,018.40 : 121,488.72 = 41,555.20 : x
2. Step 2: Convert to fraction form
   81,018.40/121,488.72 = 41,555.20/x
3. Step 3: Cross multiply
   81,018.40x = 121,488.72 × 41,555.20
4. Step 4: Simplify right side
   81,018.40x = 5,048,488,057.34
5. Step 5: Solve for x
   x = 5,048,488,057.34/81,018.40
6. Step 6: Final answer
   x = 62,312.86