Finding the Fourth Proportional to 2,608.74, 3,913.38 and 877.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.74 : 3,913.38 = 877.50 : x
2. Step 2: Convert to fraction form
   2,608.74/3,913.38 = 877.50/x
3. Step 3: Cross multiply
   2,608.74x = 3,913.38 × 877.50
4. Step 4: Simplify right side
   2,608.74x = 3,433,990.95
5. Step 5: Solve for x
   x = 3,433,990.95/2,608.74
6. Step 6: Final answer
   x = 1,316.34