Finding the Fourth Proportional to 1,089.82, 1,504.05 and 617.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.82 : 1,504.05 = 617.89 : x
2. Step 2: Convert to fraction form
   1,089.82/1,504.05 = 617.89/x
3. Step 3: Cross multiply
   1,089.82x = 1,504.05 × 617.89
4. Step 4: Simplify right side
   1,089.82x = 929,337.45
5. Step 5: Solve for x
   x = 929,337.45/1,089.82
6. Step 6: Final answer
   x = 852.74