Finding the Fourth Proportional to 12,398.49, 17,108.73 and 7,021.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,398.49 : 17,108.73 = 7,021.17 : x
2. Step 2: Convert to fraction form
   12,398.49/17,108.73 = 7,021.17/x
3. Step 3: Cross multiply
   12,398.49x = 17,108.73 × 7,021.17
4. Step 4: Simplify right side
   12,398.49x = 120,123,301.81
5. Step 5: Solve for x
   x = 120,123,301.81/12,398.49
6. Step 6: Final answer
   x = 9,688.54