Finding the Fourth Proportional to 1,388.48, 1,916.04 and 945.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.48 : 1,916.04 = 945.44 : x
2. Step 2: Convert to fraction form
   1,388.48/1,916.04 = 945.44/x
3. Step 3: Cross multiply
   1,388.48x = 1,916.04 × 945.44
4. Step 4: Simplify right side
   1,388.48x = 1,811,500.86
5. Step 5: Solve for x
   x = 1,811,500.86/1,388.48
6. Step 6: Final answer
   x = 1,304.66