Finding the Fourth Proportional to 1,387.20, 1,912.46 and 944.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.20 : 1,912.46 = 944.34 : x
2. Step 2: Convert to fraction form
   1,387.20/1,912.46 = 944.34/x
3. Step 3: Cross multiply
   1,387.20x = 1,912.46 × 944.34
4. Step 4: Simplify right side
   1,387.20x = 1,806,012.48
5. Step 5: Solve for x
   x = 1,806,012.48/1,387.20
6. Step 6: Final answer
   x = 1,301.91