Finding the Fourth Proportional to 9,915.63, 13,684.10 and 5,725.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.63 : 13,684.10 = 5,725.23 : x
2. Step 2: Convert to fraction form
   9,915.63/13,684.10 = 5,725.23/x
3. Step 3: Cross multiply
   9,915.63x = 13,684.10 × 5,725.23
4. Step 4: Simplify right side
   9,915.63x = 78,344,619.84
5. Step 5: Solve for x
   x = 78,344,619.84/9,915.63
6. Step 6: Final answer
   x = 7,901.12