Finding the Fourth Proportional to 13,138.71, 18,131.82 and 7,170.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,138.71 : 18,131.82 = 7,170.93 : x
2. Step 2: Convert to fraction form
   13,138.71/18,131.82 = 7,170.93/x
3. Step 3: Cross multiply
   13,138.71x = 18,131.82 × 7,170.93
4. Step 4: Simplify right side
   13,138.71x = 130,022,045.61
5. Step 5: Solve for x
   x = 130,022,045.61/13,138.71
6. Step 6: Final answer
   x = 9,896.11