Finding the Fourth Proportional to 9,913.17, 13,681.98 and 5,721.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,913.17 : 13,681.98 = 5,721.42 : x
2. Step 2: Convert to fraction form
   9,913.17/13,681.98 = 5,721.42/x
3. Step 3: Cross multiply
   9,913.17x = 13,681.98 × 5,721.42
4. Step 4: Simplify right side
   9,913.17x = 78,280,354.01
5. Step 5: Solve for x
   x = 78,280,354.01/9,913.17
6. Step 6: Final answer
   x = 7,896.60