Finding the Fourth Proportional to 1,089.38, 1,503.37 and 647.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.38 : 1,503.37 = 647.28 : x
2. Step 2: Convert to fraction form
   1,089.38/1,503.37 = 647.28/x
3. Step 3: Cross multiply
   1,089.38x = 1,503.37 × 647.28
4. Step 4: Simplify right side
   1,089.38x = 973,099.72
5. Step 5: Solve for x
   x = 973,099.72/1,089.38
6. Step 6: Final answer
   x = 893.26