Finding the Fourth Proportional to 9,915.56, 13,683.36 and 5,723.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.56 : 13,683.36 = 5,723.72 : x
2. Step 2: Convert to fraction form
   9,915.56/13,683.36 = 5,723.72/x
3. Step 3: Cross multiply
   9,915.56x = 13,683.36 × 5,723.72
4. Step 4: Simplify right side
   9,915.56x = 78,319,721.30
5. Step 5: Solve for x
   x = 78,319,721.30/9,915.56
6. Step 6: Final answer
   x = 7,898.67