Finding the Fourth Proportional to 1,051.59, 1,450.81 and 631.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.59 : 1,450.81 = 631.79 : x
2. Step 2: Convert to fraction form
   1,051.59/1,450.81 = 631.79/x
3. Step 3: Cross multiply
   1,051.59x = 1,450.81 × 631.79
4. Step 4: Simplify right side
   1,051.59x = 916,598.42
5. Step 5: Solve for x
   x = 916,598.42/1,051.59
6. Step 6: Final answer
   x = 871.63