Finding the Fourth Proportional to 1,398.96, 2,097.60 and 1,284.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.96 : 2,097.60 = 1,284.72 : x
2. Step 2: Convert to fraction form
   1,398.96/2,097.60 = 1,284.72/x
3. Step 3: Cross multiply
   1,398.96x = 2,097.60 × 1,284.72
4. Step 4: Simplify right side
   1,398.96x = 2,694,828.67
5. Step 5: Solve for x
   x = 2,694,828.67/1,398.96
6. Step 6: Final answer
   x = 1,926.31