Finding the Fourth Proportional to 1,384.66, 1,908.62 and 1,089.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.66 : 1,908.62 = 1,089.42 : x
2. Step 2: Convert to fraction form
   1,384.66/1,908.62 = 1,089.42/x
3. Step 3: Cross multiply
   1,384.66x = 1,908.62 × 1,089.42
4. Step 4: Simplify right side
   1,384.66x = 2,079,288.80
5. Step 5: Solve for x
   x = 2,079,288.80/1,384.66
6. Step 6: Final answer
   x = 1,501.66