Finding the Fourth Proportional to 2,185.96, 3,279.50 and 647.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.96 : 3,279.50 = 647.08 : x
2. Step 2: Convert to fraction form
   2,185.96/3,279.50 = 647.08/x
3. Step 3: Cross multiply
   2,185.96x = 3,279.50 × 647.08
4. Step 4: Simplify right side
   2,185.96x = 2,122,098.86
5. Step 5: Solve for x
   x = 2,122,098.86/2,185.96
6. Step 6: Final answer
   x = 970.79