Finding the Fourth Proportional to 1,388.49, 1,917.71 and 945.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.49 : 1,917.71 = 945.62 : x
2. Step 2: Convert to fraction form
   1,388.49/1,917.71 = 945.62/x
3. Step 3: Cross multiply
   1,388.49x = 1,917.71 × 945.62
4. Step 4: Simplify right side
   1,388.49x = 1,813,432.14
5. Step 5: Solve for x
   x = 1,813,432.14/1,388.49
6. Step 6: Final answer
   x = 1,306.04