Finding the Fourth Proportional to 4,648.40, 7,006.78 and 4,380.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,648.40 : 7,006.78 = 4,380.72 : x
2. Step 2: Convert to fraction form
   4,648.40/7,006.78 = 4,380.72/x
3. Step 3: Cross multiply
   4,648.40x = 7,006.78 × 4,380.72
4. Step 4: Simplify right side
   4,648.40x = 30,694,741.28
5. Step 5: Solve for x
   x = 30,694,741.28/4,648.40
6. Step 6: Final answer
   x = 6,603.29