Finding the Fourth Proportional to 1,384.72, 2,079.12 and 925.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.72 : 2,079.12 = 925.36 : x
2. Step 2: Convert to fraction form
   1,384.72/2,079.12 = 925.36/x
3. Step 3: Cross multiply
   1,384.72x = 2,079.12 × 925.36
4. Step 4: Simplify right side
   1,384.72x = 1,923,934.48
5. Step 5: Solve for x
   x = 1,923,934.48/1,384.72
6. Step 6: Final answer
   x = 1,389.40