Finding the Fourth Proportional to 56,608.78, 78,037.78 and 39,560.09

Step by Step Solution

1. Step 1: Write the proportion equation
   56,608.78 : 78,037.78 = 39,560.09 : x
2. Step 2: Convert to fraction form
   56,608.78/78,037.78 = 39,560.09/x
3. Step 3: Cross multiply
   56,608.78x = 78,037.78 × 39,560.09
4. Step 4: Simplify right side
   56,608.78x = 3,087,181,600.20
5. Step 5: Solve for x
   x = 3,087,181,600.20/56,608.78
6. Step 6: Final answer
   x = 54,535.39