Finding the Fourth Proportional to 2,613.60, 3,606.90 and 1,434.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.60 : 3,606.90 = 1,434.78 : x
2. Step 2: Convert to fraction form
   2,613.60/3,606.90 = 1,434.78/x
3. Step 3: Cross multiply
   2,613.60x = 3,606.90 × 1,434.78
4. Step 4: Simplify right side
   2,613.60x = 5,175,107.98
5. Step 5: Solve for x
   x = 5,175,107.98/2,613.60
6. Step 6: Final answer
   x = 1,980.07