Finding the Fourth Proportional to 1,369.16, 1,886.15 and 1,089.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.16 : 1,886.15 = 1,089.30 : x
2. Step 2: Convert to fraction form
   1,369.16/1,886.15 = 1,089.30/x
3. Step 3: Cross multiply
   1,369.16x = 1,886.15 × 1,089.30
4. Step 4: Simplify right side
   1,369.16x = 2,054,577.75
5. Step 5: Solve for x
   x = 2,054,577.75/1,369.16
6. Step 6: Final answer
   x = 1,500.62