Finding the Fourth Proportional to 9,915.81, 13,683.82 and 5,724.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.81 : 13,683.82 = 5,724.06 : x
2. Step 2: Convert to fraction form
   9,915.81/13,683.82 = 5,724.06/x
3. Step 3: Cross multiply
   9,915.81x = 13,683.82 × 5,724.06
4. Step 4: Simplify right side
   9,915.81x = 78,327,006.71
5. Step 5: Solve for x
   x = 78,327,006.71/9,915.81
6. Step 6: Final answer
   x = 7,899.20