Finding the Fourth Proportional to 2,606.50, 3,909.30 and 852.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.50 : 3,909.30 = 852.76 : x
2. Step 2: Convert to fraction form
   2,606.50/3,909.30 = 852.76/x
3. Step 3: Cross multiply
   2,606.50x = 3,909.30 × 852.76
4. Step 4: Simplify right side
   2,606.50x = 3,333,694.67
5. Step 5: Solve for x
   x = 3,333,694.67/2,606.50
6. Step 6: Final answer
   x = 1,278.99