Finding the Fourth Proportional to 56,821.02, 78,413.55 and 31,328.40

Step by Step Solution

1. Step 1: Write the proportion equation
   56,821.02 : 78,413.55 = 31,328.40 : x
2. Step 2: Convert to fraction form
   56,821.02/78,413.55 = 31,328.40/x
3. Step 3: Cross multiply
   56,821.02x = 78,413.55 × 31,328.40
4. Step 4: Simplify right side
   56,821.02x = 2,456,571,059.82
5. Step 5: Solve for x
   x = 2,456,571,059.82/56,821.02
6. Step 6: Final answer
   x = 43,233.49