Finding the Fourth Proportional to 9,142.39, 12,604.75 and 7,499.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.39 : 12,604.75 = 7,499.21 : x
2. Step 2: Convert to fraction form
   9,142.39/12,604.75 = 7,499.21/x
3. Step 3: Cross multiply
   9,142.39x = 12,604.75 × 7,499.21
4. Step 4: Simplify right side
   9,142.39x = 94,525,667.25
5. Step 5: Solve for x
   x = 94,525,667.25/9,142.39
6. Step 6: Final answer
   x = 10,339.27