Finding the Fourth Proportional to 1,894.24, 2,613.31 and 1,398.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,894.24 : 2,613.31 = 1,398.07 : x
2. Step 2: Convert to fraction form
   1,894.24/2,613.31 = 1,398.07/x
3. Step 3: Cross multiply
   1,894.24x = 2,613.31 × 1,398.07
4. Step 4: Simplify right side
   1,894.24x = 3,653,590.31
5. Step 5: Solve for x
   x = 3,653,590.31/1,894.24
6. Step 6: Final answer
   x = 1,928.79