Finding the Fourth Proportional to 1,238.69, 1,854.43 and 927.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.69 : 1,854.43 = 927.72 : x
2. Step 2: Convert to fraction form
   1,238.69/1,854.43 = 927.72/x
3. Step 3: Cross multiply
   1,238.69x = 1,854.43 × 927.72
4. Step 4: Simplify right side
   1,238.69x = 1,720,389.48
5. Step 5: Solve for x
   x = 1,720,389.48/1,238.69
6. Step 6: Final answer
   x = 1,388.88