Finding the Fourth Proportional to 1,089.16, 1,503.24 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.16 : 1,503.24 = 647.31 : x
2. Step 2: Convert to fraction form
   1,089.16/1,503.24 = 647.31/x
3. Step 3: Cross multiply
   1,089.16x = 1,503.24 × 647.31
4. Step 4: Simplify right side
   1,089.16x = 973,062.28
5. Step 5: Solve for x
   x = 973,062.28/1,089.16
6. Step 6: Final answer
   x = 893.41