Finding the Fourth Proportional to 9,725.28, 13,422.52 and 5,636.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,725.28 : 13,422.52 = 5,636.47 : x
2. Step 2: Convert to fraction form
   9,725.28/13,422.52 = 5,636.47/x
3. Step 3: Cross multiply
   9,725.28x = 13,422.52 × 5,636.47
4. Step 4: Simplify right side
   9,725.28x = 75,655,631.30
5. Step 5: Solve for x
   x = 75,655,631.30/9,725.28
6. Step 6: Final answer
   x = 7,779.28