Finding the Fourth Proportional to 1,072.05, 1,479.37 and 629.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.05 : 1,479.37 = 629.93 : x
2. Step 2: Convert to fraction form
   1,072.05/1,479.37 = 629.93/x
3. Step 3: Cross multiply
   1,072.05x = 1,479.37 × 629.93
4. Step 4: Simplify right side
   1,072.05x = 931,896.39
5. Step 5: Solve for x
   x = 931,896.39/1,072.05
6. Step 6: Final answer
   x = 869.27