Finding the Fourth Proportional to 10,380.67, 15,561.42 and 4,139.17

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380.67 : 15,561.42 = 4,139.17 : x
2. Step 2: Convert to fraction form
   10,380.67/15,561.42 = 4,139.17/x
3. Step 3: Cross multiply
   10,380.67x = 15,561.42 × 4,139.17
4. Step 4: Simplify right side
   10,380.67x = 64,411,362.82
5. Step 5: Solve for x
   x = 64,411,362.82/10,380.67
6. Step 6: Final answer
   x = 6,204.93