Finding the Fourth Proportional to 2,242.69, 3,363.90 and 781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,242.69 : 3,363.90 = 781.72 : x
2. Step 2: Convert to fraction form
   2,242.69/3,363.90 = 781.72/x
3. Step 3: Cross multiply
   2,242.69x = 3,363.90 × 781.72
4. Step 4: Simplify right side
   2,242.69x = 2,629,627.91
5. Step 5: Solve for x
   x = 2,629,627.91/2,242.69
6. Step 6: Final answer
   x = 1,172.53