Finding the Fourth Proportional to 10,621.57, 15,934.27 and 4,378.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,621.57 : 15,934.27 = 4,378.10 : x
2. Step 2: Convert to fraction form
   10,621.57/15,934.27 = 4,378.10/x
3. Step 3: Cross multiply
   10,621.57x = 15,934.27 × 4,378.10
4. Step 4: Simplify right side
   10,621.57x = 69,761,827.49
5. Step 5: Solve for x
   x = 69,761,827.49/10,621.57
6. Step 6: Final answer
   x = 6,567.94