Finding the Fourth Proportional to 1,089.50, 1,503.69 and 647.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.50 : 1,503.69 = 647.54 : x
2. Step 2: Convert to fraction form
   1,089.50/1,503.69 = 647.54/x
3. Step 3: Cross multiply
   1,089.50x = 1,503.69 × 647.54
4. Step 4: Simplify right side
   1,089.50x = 973,691.90
5. Step 5: Solve for x
   x = 973,691.90/1,089.50
6. Step 6: Final answer
   x = 893.71