Finding the Fourth Proportional to 1,388.34, 2,081.82 and 414.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.34 : 2,081.82 = 414.18 : x
2. Step 2: Convert to fraction form
   1,388.34/2,081.82 = 414.18/x
3. Step 3: Cross multiply
   1,388.34x = 2,081.82 × 414.18
4. Step 4: Simplify right side
   1,388.34x = 862,248.21
5. Step 5: Solve for x
   x = 862,248.21/1,388.34
6. Step 6: Final answer
   x = 621.06