Finding the Fourth Proportional to 81,022.80, 111,811.20 and 45,212.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,022.80 : 111,811.20 = 45,212.42 : x
2. Step 2: Convert to fraction form
   81,022.80/111,811.20 = 45,212.42/x
3. Step 3: Cross multiply
   81,022.80x = 111,811.20 × 45,212.42
4. Step 4: Simplify right side
   81,022.80x = 5,055,254,935.10
5. Step 5: Solve for x
   x = 5,055,254,935.10/81,022.80
6. Step 6: Final answer
   x = 62,392.99