Finding the Fourth Proportional to 1,389.29, 2,081.57 and 1,214.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.29 : 2,081.57 = 1,214.03 : x
2. Step 2: Convert to fraction form
   1,389.29/2,081.57 = 1,214.03/x
3. Step 3: Cross multiply
   1,389.29x = 2,081.57 × 1,214.03
4. Step 4: Simplify right side
   1,389.29x = 2,527,071.95
5. Step 5: Solve for x
   x = 2,527,071.95/1,389.29
6. Step 6: Final answer
   x = 1,818.97