Finding the Fourth Proportional to 2,290.79, 3,436.82 and 647.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.79 : 3,436.82 = 647.35 : x
2. Step 2: Convert to fraction form
   2,290.79/3,436.82 = 647.35/x
3. Step 3: Cross multiply
   2,290.79x = 3,436.82 × 647.35
4. Step 4: Simplify right side
   2,290.79x = 2,224,825.43
5. Step 5: Solve for x
   x = 2,224,825.43/2,290.79
6. Step 6: Final answer
   x = 971.20