Finding the Fourth Proportional to 1,019.99, 1,408.16 and 671.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.99 : 1,408.16 = 671.69 : x
2. Step 2: Convert to fraction form
   1,019.99/1,408.16 = 671.69/x
3. Step 3: Cross multiply
   1,019.99x = 1,408.16 × 671.69
4. Step 4: Simplify right side
   1,019.99x = 945,841.63
5. Step 5: Solve for x
   x = 945,841.63/1,019.99
6. Step 6: Final answer
   x = 927.31