Finding the Fourth Proportional to 2,720.04, 4,080.32 and 870.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,720.04 : 4,080.32 = 870.69 : x
2. Step 2: Convert to fraction form
   2,720.04/4,080.32 = 870.69/x
3. Step 3: Cross multiply
   2,720.04x = 4,080.32 × 870.69
4. Step 4: Simplify right side
   2,720.04x = 3,552,693.82
5. Step 5: Solve for x
   x = 3,552,693.82/2,720.04
6. Step 6: Final answer
   x = 1,306.12