Finding the Fourth Proportional to 9,975.76, 13,762.68 and 5,725.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,975.76 : 13,762.68 = 5,725.28 : x
2. Step 2: Convert to fraction form
   9,975.76/13,762.68 = 5,725.28/x
3. Step 3: Cross multiply
   9,975.76x = 13,762.68 × 5,725.28
4. Step 4: Simplify right side
   9,975.76x = 78,795,196.55
5. Step 5: Solve for x
   x = 78,795,196.55/9,975.76
6. Step 6: Final answer
   x = 7,898.67