Finding the Fourth Proportional to 2,569.59, 3,546.07 and 1,390.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.59 : 3,546.07 = 1,390.69 : x
2. Step 2: Convert to fraction form
   2,569.59/3,546.07 = 1,390.69/x
3. Step 3: Cross multiply
   2,569.59x = 3,546.07 × 1,390.69
4. Step 4: Simplify right side
   2,569.59x = 4,931,475.79
5. Step 5: Solve for x
   x = 4,931,475.79/2,569.59
6. Step 6: Final answer
   x = 1,919.17