Finding the Fourth Proportional to 12,621.42, 17,417.70 and 7,908.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,621.42 : 17,417.70 = 7,908.48 : x
2. Step 2: Convert to fraction form
   12,621.42/17,417.70 = 7,908.48/x
3. Step 3: Cross multiply
   12,621.42x = 17,417.70 × 7,908.48
4. Step 4: Simplify right side
   12,621.42x = 137,747,532.10
5. Step 5: Solve for x
   x = 137,747,532.10/12,621.42
6. Step 6: Final answer
   x = 10,913.79