Finding the Fourth Proportional to 1,089.91, 1,504.29 and 647.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.91 : 1,504.29 = 647.89 : x
2. Step 2: Convert to fraction form
   1,089.91/1,504.29 = 647.89/x
3. Step 3: Cross multiply
   1,089.91x = 1,504.29 × 647.89
4. Step 4: Simplify right side
   1,089.91x = 974,614.45
5. Step 5: Solve for x
   x = 974,614.45/1,089.91
6. Step 6: Final answer
   x = 894.22