Finding the Fourth Proportional to 1,119.50, 1,544.90 and 647.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,119.50 : 1,544.90 = 647.39 : x
2. Step 2: Convert to fraction form
   1,119.50/1,544.90 = 647.39/x
3. Step 3: Cross multiply
   1,119.50x = 1,544.90 × 647.39
4. Step 4: Simplify right side
   1,119.50x = 1,000,141.85
5. Step 5: Solve for x
   x = 1,000,141.85/1,119.50
6. Step 6: Final answer
   x = 893.39