Finding the Fourth Proportional to 2,275.84, 3,139.68 and 1,435.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.84 : 3,139.68 = 1,435.87 : x
2. Step 2: Convert to fraction form
   2,275.84/3,139.68 = 1,435.87/x
3. Step 3: Cross multiply
   2,275.84x = 3,139.68 × 1,435.87
4. Step 4: Simplify right side
   2,275.84x = 4,508,172.32
5. Step 5: Solve for x
   x = 4,508,172.32/2,275.84
6. Step 6: Final answer
   x = 1,980.88