Finding the Fourth Proportional to 2,091.88, 3,138.06 and 631.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.88 : 3,138.06 = 631.12 : x
2. Step 2: Convert to fraction form
   2,091.88/3,138.06 = 631.12/x
3. Step 3: Cross multiply
   2,091.88x = 3,138.06 × 631.12
4. Step 4: Simplify right side
   2,091.88x = 1,980,492.43
5. Step 5: Solve for x
   x = 1,980,492.43/2,091.88
6. Step 6: Final answer
   x = 946.75