Finding the Fourth Proportional to 2,606.78, 3,910.10 and 875.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.78 : 3,910.10 = 875.40 : x
2. Step 2: Convert to fraction form
   2,606.78/3,910.10 = 875.40/x
3. Step 3: Cross multiply
   2,606.78x = 3,910.10 × 875.40
4. Step 4: Simplify right side
   2,606.78x = 3,422,897.16
5. Step 5: Solve for x
   x = 3,422,897.16/2,606.78
6. Step 6: Final answer
   x = 1,313.08