Finding the Fourth Proportional to 2,631.10, 3,947.38 and 782.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.10 : 3,947.38 = 782.22 : x
2. Step 2: Convert to fraction form
   2,631.10/3,947.38 = 782.22/x
3. Step 3: Cross multiply
   2,631.10x = 3,947.38 × 782.22
4. Step 4: Simplify right side
   2,631.10x = 3,087,719.58
5. Step 5: Solve for x
   x = 3,087,719.58/2,631.10
6. Step 6: Final answer
   x = 1,173.55