Finding the Fourth Proportional to 2,630.58, 3,946.48 and 781.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.58 : 3,946.48 = 781.71 : x
2. Step 2: Convert to fraction form
   2,630.58/3,946.48 = 781.71/x
3. Step 3: Cross multiply
   2,630.58x = 3,946.48 × 781.71
4. Step 4: Simplify right side
   2,630.58x = 3,085,002.88
5. Step 5: Solve for x
   x = 3,085,002.88/2,630.58
6. Step 6: Final answer
   x = 1,172.75