Finding the Fourth Proportional to 1,411.08, 2,115.88 and 826.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.08 : 2,115.88 = 826.28 : x
2. Step 2: Convert to fraction form
   1,411.08/2,115.88 = 826.28/x
3. Step 3: Cross multiply
   1,411.08x = 2,115.88 × 826.28
4. Step 4: Simplify right side
   1,411.08x = 1,748,309.33
5. Step 5: Solve for x
   x = 1,748,309.33/1,411.08
6. Step 6: Final answer
   x = 1,238.99