Finding the Fourth Proportional to 2,621.32, 3,929.54 and 1,387.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.32 : 3,929.54 = 1,387.69 : x
2. Step 2: Convert to fraction form
   2,621.32/3,929.54 = 1,387.69/x
3. Step 3: Cross multiply
   2,621.32x = 3,929.54 × 1,387.69
4. Step 4: Simplify right side
   2,621.32x = 5,452,977.01
5. Step 5: Solve for x
   x = 5,452,977.01/2,621.32
6. Step 6: Final answer
   x = 2,080.24