Finding the Fourth Proportional to 81,238.85, 112,111.09 and 45,428.09

Step by Step Solution

1. Step 1: Write the proportion equation
   81,238.85 : 112,111.09 = 45,428.09 : x
2. Step 2: Convert to fraction form
   81,238.85/112,111.09 = 45,428.09/x
3. Step 3: Cross multiply
   81,238.85x = 112,111.09 × 45,428.09
4. Step 4: Simplify right side
   81,238.85x = 5,092,992,643.02
5. Step 5: Solve for x
   x = 5,092,992,643.02/81,238.85
6. Step 6: Final answer
   x = 62,691.59