Finding the Fourth Proportional to 12,839.86, 17,718.79 and 7,174.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.86 : 17,718.79 = 7,174.69 : x
2. Step 2: Convert to fraction form
   12,839.86/17,718.79 = 7,174.69/x
3. Step 3: Cross multiply
   12,839.86x = 17,718.79 × 7,174.69
4. Step 4: Simplify right side
   12,839.86x = 127,126,825.43
5. Step 5: Solve for x
   x = 127,126,825.43/12,839.86
6. Step 6: Final answer
   x = 9,900.95