Finding the Fourth Proportional to 2,275.56, 3,412.78 and 631.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.56 : 3,412.78 = 631.72 : x
2. Step 2: Convert to fraction form
   2,275.56/3,412.78 = 631.72/x
3. Step 3: Cross multiply
   2,275.56x = 3,412.78 × 631.72
4. Step 4: Simplify right side
   2,275.56x = 2,155,921.38
5. Step 5: Solve for x
   x = 2,155,921.38/2,275.56
6. Step 6: Final answer
   x = 947.42