Finding the Fourth Proportional to 2,426.78, 3,347.78 and 1,587.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.78 : 3,347.78 = 1,587.12 : x
2. Step 2: Convert to fraction form
   2,426.78/3,347.78 = 1,587.12/x
3. Step 3: Cross multiply
   2,426.78x = 3,347.78 × 1,587.12
4. Step 4: Simplify right side
   2,426.78x = 5,313,328.59
5. Step 5: Solve for x
   x = 5,313,328.59/2,426.78
6. Step 6: Final answer
   x = 2,189.46