Finding the Fourth Proportional to 2,622.32, 3,931.04 and 1,388.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.32 : 3,931.04 = 1,388.69 : x
2. Step 2: Convert to fraction form
   2,622.32/3,931.04 = 1,388.69/x
3. Step 3: Cross multiply
   2,622.32x = 3,931.04 × 1,388.69
4. Step 4: Simplify right side
   2,622.32x = 5,458,995.94
5. Step 5: Solve for x
   x = 5,458,995.94/2,622.32
6. Step 6: Final answer
   x = 2,081.74