Finding the Fourth Proportional to 9,965.12, 13,746.72 and 6,422.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,965.12 : 13,746.72 = 6,422.72 : x
2. Step 2: Convert to fraction form
   9,965.12/13,746.72 = 6,422.72/x
3. Step 3: Cross multiply
   9,965.12x = 13,746.72 × 6,422.72
4. Step 4: Simplify right side
   9,965.12x = 88,291,333.48
5. Step 5: Solve for x
   x = 88,291,333.48/9,965.12
6. Step 6: Final answer
   x = 8,860.04