Finding the Fourth Proportional to 64,778.80, 89,436.02 and 52,870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   64,778.80 : 89,436.02 = 52,870.56 : x
2. Step 2: Convert to fraction form
   64,778.80/89,436.02 = 52,870.56/x
3. Step 3: Cross multiply
   64,778.80x = 89,436.02 × 52,870.56
4. Step 4: Simplify right side
   64,778.80x = 4,728,532,461.57
5. Step 5: Solve for x
   x = 4,728,532,461.57/64,778.80
6. Step 6: Final answer
   x = 72,995.06