Finding the Fourth Proportional to 4,728.72, 7,106.52 and 3,200.40

Step by Step Solution

1. Step 1: Write the proportion equation
   4,728.72 : 7,106.52 = 3,200.40 : x
2. Step 2: Convert to fraction form
   4,728.72/7,106.52 = 3,200.40/x
3. Step 3: Cross multiply
   4,728.72x = 7,106.52 × 3,200.40
4. Step 4: Simplify right side
   4,728.72x = 22,743,706.61
5. Step 5: Solve for x
   x = 22,743,706.61/4,728.72
6. Step 6: Final answer
   x = 4,809.70