Finding the Fourth Proportional to 9,642.72, 13,302.72 and 7,400.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,642.72 : 13,302.72 = 7,400.64 : x
2. Step 2: Convert to fraction form
   9,642.72/13,302.72 = 7,400.64/x
3. Step 3: Cross multiply
   9,642.72x = 13,302.72 × 7,400.64
4. Step 4: Simplify right side
   9,642.72x = 98,448,641.74
5. Step 5: Solve for x
   x = 98,448,641.74/9,642.72
6. Step 6: Final answer
   x = 10,209.63