Finding the Fourth Proportional to 81,456.72, 112,413.30 and 45,645.40

Step by Step Solution

1. Step 1: Write the proportion equation
   81,456.72 : 112,413.30 = 45,645.40 : x
2. Step 2: Convert to fraction form
   81,456.72/112,413.30 = 45,645.40/x
3. Step 3: Cross multiply
   81,456.72x = 112,413.30 × 45,645.40
4. Step 4: Simplify right side
   81,456.72x = 5,131,150,043.82
5. Step 5: Solve for x
   x = 5,131,150,043.82/81,456.72
6. Step 6: Final answer
   x = 62,992.35