Finding the Fourth Proportional to 1,384.30, 1,909.40 and 1,089.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.30 : 1,909.40 = 1,089.05 : x
2. Step 2: Convert to fraction form
   1,384.30/1,909.40 = 1,089.05/x
3. Step 3: Cross multiply
   1,384.30x = 1,909.40 × 1,089.05
4. Step 4: Simplify right side
   1,384.30x = 2,079,431.40
5. Step 5: Solve for x
   x = 2,079,431.40/1,384.30
6. Step 6: Final answer
   x = 1,502.16