Finding the Fourth Proportional to 2,606.12, 3,909.98 and 874.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.12 : 3,909.98 = 874.60 : x
2. Step 2: Convert to fraction form
   2,606.12/3,909.98 = 874.60/x
3. Step 3: Cross multiply
   2,606.12x = 3,909.98 × 874.60
4. Step 4: Simplify right side
   2,606.12x = 3,419,668.51
5. Step 5: Solve for x
   x = 3,419,668.51/2,606.12
6. Step 6: Final answer
   x = 1,312.17