Finding the Fourth Proportional to 56,805, 78,308.92 and 39,756.48

Step by Step Solution

1. Step 1: Write the proportion equation
   56,805 : 78,308.92 = 39,756.48 : x
2. Step 2: Convert to fraction form
   56,805/78,308.92 = 39,756.48/x
3. Step 3: Cross multiply
   56,805x = 78,308.92 × 39,756.48
4. Step 4: Simplify right side
   56,805x = 3,113,287,011.80
5. Step 5: Solve for x
   x = 3,113,287,011.80/56,805
6. Step 6: Final answer
   x = 54,806.57