Finding the Fourth Proportional to 10,913.75, 15,057.02 and 7,139.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,913.75 : 15,057.02 = 7,139.06 : x
2. Step 2: Convert to fraction form
   10,913.75/15,057.02 = 7,139.06/x
3. Step 3: Cross multiply
   10,913.75x = 15,057.02 × 7,139.06
4. Step 4: Simplify right side
   10,913.75x = 107,492,933.51
5. Step 5: Solve for x
   x = 107,492,933.51/10,913.75
6. Step 6: Final answer
   x = 9,849.32