Finding the Fourth Proportional to 9,860.28, 13,605.72 and 5,667.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,860.28 : 13,605.72 = 5,667.72 : x
2. Step 2: Convert to fraction form
   9,860.28/13,605.72 = 5,667.72/x
3. Step 3: Cross multiply
   9,860.28x = 13,605.72 × 5,667.72
4. Step 4: Simplify right side
   9,860.28x = 77,113,411.36
5. Step 5: Solve for x
   x = 77,113,411.36/9,860.28
6. Step 6: Final answer
   x = 7,820.61