Finding the Fourth Proportional to 10,380.24, 15,561.72 and 4,136.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380.24 : 15,561.72 = 4,136.40 : x
2. Step 2: Convert to fraction form
   10,380.24/15,561.72 = 4,136.40/x
3. Step 3: Cross multiply
   10,380.24x = 15,561.72 × 4,136.40
4. Step 4: Simplify right side
   10,380.24x = 64,369,498.61
5. Step 5: Solve for x
   x = 64,369,498.61/10,380.24
6. Step 6: Final answer
   x = 6,201.16