Finding the Fourth Proportional to 1,910.78, 2,638.13 and 1,323.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.78 : 2,638.13 = 1,323.12 : x
2. Step 2: Convert to fraction form
   1,910.78/2,638.13 = 1,323.12/x
3. Step 3: Cross multiply
   1,910.78x = 2,638.13 × 1,323.12
4. Step 4: Simplify right side
   1,910.78x = 3,490,562.57
5. Step 5: Solve for x
   x = 3,490,562.57/1,910.78
6. Step 6: Final answer
   x = 1,826.77