Finding the Fourth Proportional to 2,520.79, 3,782.91 and 877.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.79 : 3,782.91 = 877.32 : x
2. Step 2: Convert to fraction form
   2,520.79/3,782.91 = 877.32/x
3. Step 3: Cross multiply
   2,520.79x = 3,782.91 × 877.32
4. Step 4: Simplify right side
   2,520.79x = 3,318,822.60
5. Step 5: Solve for x
   x = 3,318,822.60/2,520.79
6. Step 6: Final answer
   x = 1,316.58