Finding the Fourth Proportional to 2,389.62, 3,298.07 and 1,394.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.62 : 3,298.07 = 1,394.89 : x
2. Step 2: Convert to fraction form
   2,389.62/3,298.07 = 1,394.89/x
3. Step 3: Cross multiply
   2,389.62x = 3,298.07 × 1,394.89
4. Step 4: Simplify right side
   2,389.62x = 4,600,444.86
5. Step 5: Solve for x
   x = 4,600,444.86/2,389.62
6. Step 6: Final answer
   x = 1,925.18