Finding the Fourth Proportional to 2,091.98, 3,138.12 and 631.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.98 : 3,138.12 = 631.25 : x
2. Step 2: Convert to fraction form
   2,091.98/3,138.12 = 631.25/x
3. Step 3: Cross multiply
   2,091.98x = 3,138.12 × 631.25
4. Step 4: Simplify right side
   2,091.98x = 1,980,922.56
5. Step 5: Solve for x
   x = 1,980,922.56/2,091.98
6. Step 6: Final answer
   x = 946.92