Finding the Fourth Proportional to 13,105.53, 18,086.02 and 7,137.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.53 : 18,086.02 = 7,137.45 : x
2. Step 2: Convert to fraction form
   13,105.53/18,086.02 = 7,137.45/x
3. Step 3: Cross multiply
   13,105.53x = 18,086.02 × 7,137.45
4. Step 4: Simplify right side
   13,105.53x = 129,088,045.61
5. Step 5: Solve for x
   x = 129,088,045.61/13,105.53
6. Step 6: Final answer
   x = 9,849.89