Finding the Fourth Proportional to 13,488.50, 18,614.13 and 7,899.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,488.50 : 18,614.13 = 7,899.50 : x
2. Step 2: Convert to fraction form
   13,488.50/18,614.13 = 7,899.50/x
3. Step 3: Cross multiply
   13,488.50x = 18,614.13 × 7,899.50
4. Step 4: Simplify right side
   13,488.50x = 147,042,319.94
5. Step 5: Solve for x
   x = 147,042,319.94/13,488.50
6. Step 6: Final answer
   x = 10,901.31