Finding the Fourth Proportional to 2,602.95, 3,904.41 and 871.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.95 : 3,904.41 = 871.57 : x
2. Step 2: Convert to fraction form
   2,602.95/3,904.41 = 871.57/x
3. Step 3: Cross multiply
   2,602.95x = 3,904.41 × 871.57
4. Step 4: Simplify right side
   2,602.95x = 3,402,966.62
5. Step 5: Solve for x
   x = 3,402,966.62/2,602.95
6. Step 6: Final answer
   x = 1,307.35