Finding the Fourth Proportional to 1,401.31, 2,101.72 and 631.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.31 : 2,101.72 = 631.63 : x
2. Step 2: Convert to fraction form
   1,401.31/2,101.72 = 631.63/x
3. Step 3: Cross multiply
   1,401.31x = 2,101.72 × 631.63
4. Step 4: Simplify right side
   1,401.31x = 1,327,504.94
5. Step 5: Solve for x
   x = 1,327,504.94/1,401.31
6. Step 6: Final answer
   x = 947.33