Finding the Fourth Proportional to 12,422.31, 17,142.93 and 7,117.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,422.31 : 17,142.93 = 7,117.02 : x
2. Step 2: Convert to fraction form
   12,422.31/17,142.93 = 7,117.02/x
3. Step 3: Cross multiply
   12,422.31x = 17,142.93 × 7,117.02
4. Step 4: Simplify right side
   12,422.31x = 122,006,454.37
5. Step 5: Solve for x
   x = 122,006,454.37/12,422.31
6. Step 6: Final answer
   x = 9,821.56