Finding the Fourth Proportional to 12,421.58, 17,143.24 and 7,118.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,421.58 : 17,143.24 = 7,118.10 : x
2. Step 2: Convert to fraction form
   12,421.58/17,143.24 = 7,118.10/x
3. Step 3: Cross multiply
   12,421.58x = 17,143.24 × 7,118.10
4. Step 4: Simplify right side
   12,421.58x = 122,027,296.64
5. Step 5: Solve for x
   x = 122,027,296.64/12,421.58
6. Step 6: Final answer
   x = 9,823.81