Finding the Fourth Proportional to 1,050.67, 1,449.98 and 631.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.67 : 1,449.98 = 631.05 : x
2. Step 2: Convert to fraction form
   1,050.67/1,449.98 = 631.05/x
3. Step 3: Cross multiply
   1,050.67x = 1,449.98 × 631.05
4. Step 4: Simplify right side
   1,050.67x = 915,009.88
5. Step 5: Solve for x
   x = 915,009.88/1,050.67
6. Step 6: Final answer
   x = 870.88