Finding the Fourth Proportional to 56,815, 78,322.72 and 39,766.48

Step by Step Solution

1. Step 1: Write the proportion equation
   56,815 : 78,322.72 = 39,766.48 : x
2. Step 2: Convert to fraction form
   56,815/78,322.72 = 39,766.48/x
3. Step 3: Cross multiply
   56,815x = 78,322.72 × 39,766.48
4. Step 4: Simplify right side
   56,815x = 3,114,618,878.43
5. Step 5: Solve for x
   x = 3,114,618,878.43/56,815
6. Step 6: Final answer
   x = 54,820.36