Finding the Fourth Proportional to 2,275.46, 3,139.28 and 1,435.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.46 : 3,139.28 = 1,435.86 : x
2. Step 2: Convert to fraction form
   2,275.46/3,139.28 = 1,435.86/x
3. Step 3: Cross multiply
   2,275.46x = 3,139.28 × 1,435.86
4. Step 4: Simplify right side
   2,275.46x = 4,507,571.71
5. Step 5: Solve for x
   x = 4,507,571.71/2,275.46
6. Step 6: Final answer
   x = 1,980.95