Finding the Fourth Proportional to 1,017.72, 1,405.62 and 669.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.72 : 1,405.62 = 669.96 : x
2. Step 2: Convert to fraction form
   1,017.72/1,405.62 = 669.96/x
3. Step 3: Cross multiply
   1,017.72x = 1,405.62 × 669.96
4. Step 4: Simplify right side
   1,017.72x = 941,709.18
5. Step 5: Solve for x
   x = 941,709.18/1,017.72
6. Step 6: Final answer
   x = 925.31