Finding the Fourth Proportional to 2,630.50, 3,945.61 and 781.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.50 : 3,945.61 = 781.63 : x
2. Step 2: Convert to fraction form
   2,630.50/3,945.61 = 781.63/x
3. Step 3: Cross multiply
   2,630.50x = 3,945.61 × 781.63
4. Step 4: Simplify right side
   2,630.50x = 3,084,007.14
5. Step 5: Solve for x
   x = 3,084,007.14/2,630.50
6. Step 6: Final answer
   x = 1,172.40