Finding the Fourth Proportional to 12,488.98, 18,720.50 and 5,910.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.98 : 18,720.50 = 5,910.16 : x
2. Step 2: Convert to fraction form
   12,488.98/18,720.50 = 5,910.16/x
3. Step 3: Cross multiply
   12,488.98x = 18,720.50 × 5,910.16
4. Step 4: Simplify right side
   12,488.98x = 110,641,150.28
5. Step 5: Solve for x
   x = 110,641,150.28/12,488.98
6. Step 6: Final answer
   x = 8,859.10