Finding the Fourth Proportional to 56,856.96, 78,366.24 and 39,866.40

Step by Step Solution

1. Step 1: Write the proportion equation
   56,856.96 : 78,366.24 = 39,866.40 : x
2. Step 2: Convert to fraction form
   56,856.96/78,366.24 = 39,866.40/x
3. Step 3: Cross multiply
   56,856.96x = 78,366.24 × 39,866.40
4. Step 4: Simplify right side
   56,856.96x = 3,124,179,870.34
5. Step 5: Solve for x
   x = 3,124,179,870.34/56,856.96
6. Step 6: Final answer
   x = 54,948.06