Finding the Fourth Proportional to 13,039.49, 17,988.54 and 7,731.29

Step by Step Solution

1. Step 1: Write the proportion equation
   13,039.49 : 17,988.54 = 7,731.29 : x
2. Step 2: Convert to fraction form
   13,039.49/17,988.54 = 7,731.29/x
3. Step 3: Cross multiply
   13,039.49x = 17,988.54 × 7,731.29
4. Step 4: Simplify right side
   13,039.49x = 139,074,619.42
5. Step 5: Solve for x
   x = 139,074,619.42/13,039.49
6. Step 6: Final answer
   x = 10,665.65