Finding the Fourth Proportional to 1,072.31, 1,479.27 and 629.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.31 : 1,479.27 = 629.93 : x
2. Step 2: Convert to fraction form
   1,072.31/1,479.27 = 629.93/x
3. Step 3: Cross multiply
   1,072.31x = 1,479.27 × 629.93
4. Step 4: Simplify right side
   1,072.31x = 931,836.55
5. Step 5: Solve for x
   x = 931,836.55/1,072.31
6. Step 6: Final answer
   x = 869.00