Finding the Fourth Proportional to 81,101.34, 111,920.40 and 45,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   81,101.34 : 111,920.40 = 45,291.78 : x
2. Step 2: Convert to fraction form
   81,101.34/111,920.40 = 45,291.78/x
3. Step 3: Cross multiply
   81,101.34x = 111,920.40 × 45,291.78
4. Step 4: Simplify right side
   81,101.34x = 5,069,074,134.31
5. Step 5: Solve for x
   x = 5,069,074,134.31/81,101.34
6. Step 6: Final answer
   x = 62,502.96