Finding the Fourth Proportional to 1,424.07, 2,147.06 and 1,398.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.07 : 2,147.06 = 1,398.55 : x
2. Step 2: Convert to fraction form
   1,424.07/2,147.06 = 1,398.55/x
3. Step 3: Cross multiply
   1,424.07x = 2,147.06 × 1,398.55
4. Step 4: Simplify right side
   1,424.07x = 3,002,770.76
5. Step 5: Solve for x
   x = 3,002,770.76/1,424.07
6. Step 6: Final answer
   x = 2,108.58