Finding the Fourth Proportional to 1,389.84, 2,086.18 and 930.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.84 : 2,086.18 = 930.82 : x
2. Step 2: Convert to fraction form
   1,389.84/2,086.18 = 930.82/x
3. Step 3: Cross multiply
   1,389.84x = 2,086.18 × 930.82
4. Step 4: Simplify right side
   1,389.84x = 1,941,856.18
5. Step 5: Solve for x
   x = 1,941,856.18/1,389.84
6. Step 6: Final answer
   x = 1,397.18