Finding the Fourth Proportional to 12,608.42, 17,411.42 and 7,900.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,608.42 : 17,411.42 = 7,900.90 : x
2. Step 2: Convert to fraction form
   12,608.42/17,411.42 = 7,900.90/x
3. Step 3: Cross multiply
   12,608.42x = 17,411.42 × 7,900.90
4. Step 4: Simplify right side
   12,608.42x = 137,565,864.50
5. Step 5: Solve for x
   x = 137,565,864.50/12,608.42
6. Step 6: Final answer
   x = 10,910.64