Finding the Fourth Proportional to 1,227.23, 1,693.59 and 667.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.23 : 1,693.59 = 667.71 : x
2. Step 2: Convert to fraction form
   1,227.23/1,693.59 = 667.71/x
3. Step 3: Cross multiply
   1,227.23x = 1,693.59 × 667.71
4. Step 4: Simplify right side
   1,227.23x = 1,130,826.98
5. Step 5: Solve for x
   x = 1,130,826.98/1,227.23
6. Step 6: Final answer
   x = 921.45