Finding the Fourth Proportional to 56,815.50, 78,323.41 and 39,766.98

Step by Step Solution

1. Step 1: Write the proportion equation
   56,815.50 : 78,323.41 = 39,766.98 : x
2. Step 2: Convert to fraction form
   56,815.50/78,323.41 = 39,766.98/x
3. Step 3: Cross multiply
   56,815.50x = 78,323.41 × 39,766.98
4. Step 4: Simplify right side
   56,815.50x = 3,114,685,479.00
5. Step 5: Solve for x
   x = 3,114,685,479.00/56,815.50
6. Step 6: Final answer
   x = 54,821.05