Finding the Fourth Proportional to 12,449.98, 17,180.83 and 7,145.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,449.98 : 17,180.83 = 7,145.64 : x
2. Step 2: Convert to fraction form
   12,449.98/17,180.83 = 7,145.64/x
3. Step 3: Cross multiply
   12,449.98x = 17,180.83 × 7,145.64
4. Step 4: Simplify right side
   12,449.98x = 122,768,026.08
5. Step 5: Solve for x
   x = 122,768,026.08/12,449.98
6. Step 6: Final answer
   x = 9,860.90