Finding the Fourth Proportional to 1,085.82, 1,624.69 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.82 : 1,624.69 = 647.31 : x
2. Step 2: Convert to fraction form
   1,085.82/1,624.69 = 647.31/x
3. Step 3: Cross multiply
   1,085.82x = 1,624.69 × 647.31
4. Step 4: Simplify right side
   1,085.82x = 1,051,666.72
5. Step 5: Solve for x
   x = 1,051,666.72/1,085.82
6. Step 6: Final answer
   x = 968.55