Finding the Fourth Proportional to 1,051.59, 1,451.12 and 631.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.59 : 1,451.12 = 631.69 : x
2. Step 2: Convert to fraction form
   1,051.59/1,451.12 = 631.69/x
3. Step 3: Cross multiply
   1,051.59x = 1,451.12 × 631.69
4. Step 4: Simplify right side
   1,051.59x = 916,652.79
5. Step 5: Solve for x
   x = 916,652.79/1,051.59
6. Step 6: Final answer
   x = 871.69