Finding the Fourth Proportional to 1,089.14, 1,503.30 and 647.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.14 : 1,503.30 = 647.34 : x
2. Step 2: Convert to fraction form
   1,089.14/1,503.30 = 647.34/x
3. Step 3: Cross multiply
   1,089.14x = 1,503.30 × 647.34
4. Step 4: Simplify right side
   1,089.14x = 973,146.22
5. Step 5: Solve for x
   x = 973,146.22/1,089.14
6. Step 6: Final answer
   x = 893.50