Finding the Fourth Proportional to 12,421.48, 17,142.90 and 7,117

Step by Step Solution

1. Step 1: Write the proportion equation
   12,421.48 : 17,142.90 = 7,117 : x
2. Step 2: Convert to fraction form
   12,421.48/17,142.90 = 7,117/x
3. Step 3: Cross multiply
   12,421.48x = 17,142.90 × 7,117
4. Step 4: Simplify right side
   12,421.48x = 122,006,019.30
5. Step 5: Solve for x
   x = 122,006,019.30/12,421.48
6. Step 6: Final answer
   x = 9,822.18