Finding the Fourth Proportional to 1,394.18, 2,087.17 and 930.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.18 : 2,087.17 = 930.81 : x
2. Step 2: Convert to fraction form
   1,394.18/2,087.17 = 930.81/x
3. Step 3: Cross multiply
   1,394.18x = 2,087.17 × 930.81
4. Step 4: Simplify right side
   1,394.18x = 1,942,758.13
5. Step 5: Solve for x
   x = 1,942,758.13/1,394.18
6. Step 6: Final answer
   x = 1,393.48