Finding the Fourth Proportional to 12,424.95, 17,139.15 and 7,947.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,424.95 : 17,139.15 = 7,947.07 : x
2. Step 2: Convert to fraction form
   12,424.95/17,139.15 = 7,947.07/x
3. Step 3: Cross multiply
   12,424.95x = 17,139.15 × 7,947.07
4. Step 4: Simplify right side
   12,424.95x = 136,205,981.94
5. Step 5: Solve for x
   x = 136,205,981.94/12,424.95
6. Step 6: Final answer
   x = 10,962.30