Finding the Fourth Proportional to 2,604.76, 3,905.88 and 872.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,604.76 : 3,905.88 = 872.16 : x
2. Step 2: Convert to fraction form
   2,604.76/3,905.88 = 872.16/x
3. Step 3: Cross multiply
   2,604.76x = 3,905.88 × 872.16
4. Step 4: Simplify right side
   2,604.76x = 3,406,552.30
5. Step 5: Solve for x
   x = 3,406,552.30/2,604.76
6. Step 6: Final answer
   x = 1,307.82