Finding the Fourth Proportional to 2,630.01, 3,945.63 and 781.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.01 : 3,945.63 = 781.09 : x
2. Step 2: Convert to fraction form
   2,630.01/3,945.63 = 781.09/x
3. Step 3: Cross multiply
   2,630.01x = 3,945.63 × 781.09
4. Step 4: Simplify right side
   2,630.01x = 3,081,880.32
5. Step 5: Solve for x
   x = 3,081,880.32/2,630.01
6. Step 6: Final answer
   x = 1,171.81