Finding the Fourth Proportional to 7,339.72, 10,128.58 and 4,152.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,339.72 : 10,128.58 = 4,152.78 : x
2. Step 2: Convert to fraction form
   7,339.72/10,128.58 = 4,152.78/x
3. Step 3: Cross multiply
   7,339.72x = 10,128.58 × 4,152.78
4. Step 4: Simplify right side
   7,339.72x = 42,061,764.45
5. Step 5: Solve for x
   x = 42,061,764.45/7,339.72
6. Step 6: Final answer
   x = 5,730.70