Finding the Fourth Proportional to 1,398.42, 1,929.92 and 925.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.42 : 1,929.92 = 925.50 : x
2. Step 2: Convert to fraction form
   1,398.42/1,929.92 = 925.50/x
3. Step 3: Cross multiply
   1,398.42x = 1,929.92 × 925.50
4. Step 4: Simplify right side
   1,398.42x = 1,786,136.33
5. Step 5: Solve for x
   x = 1,786,136.33/1,398.42
6. Step 6: Final answer
   x = 1,277.25