Finding the Fourth Proportional to 2,542.32, 3,820.20 and 1,388.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,542.32 : 3,820.20 = 1,388.88 : x
2. Step 2: Convert to fraction form
   2,542.32/3,820.20 = 1,388.88/x
3. Step 3: Cross multiply
   2,542.32x = 3,820.20 × 1,388.88
4. Step 4: Simplify right side
   2,542.32x = 5,305,799.38
5. Step 5: Solve for x
   x = 5,305,799.38/2,542.32
6. Step 6: Final answer
   x = 2,086.99