Finding the Fourth Proportional to 12,839.15, 17,717.70 and 7,173.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.15 : 17,717.70 = 7,173.93 : x
2. Step 2: Convert to fraction form
   12,839.15/17,717.70 = 7,173.93/x
3. Step 3: Cross multiply
   12,839.15x = 17,717.70 × 7,173.93
4. Step 4: Simplify right side
   12,839.15x = 127,105,539.56
5. Step 5: Solve for x
   x = 127,105,539.56/12,839.15
6. Step 6: Final answer
   x = 9,899.84