Finding the Fourth Proportional to 1,362.70, 1,880.89 and 839.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.70 : 1,880.89 = 839.17 : x
2. Step 2: Convert to fraction form
   1,362.70/1,880.89 = 839.17/x
3. Step 3: Cross multiply
   1,362.70x = 1,880.89 × 839.17
4. Step 4: Simplify right side
   1,362.70x = 1,578,392.21
5. Step 5: Solve for x
   x = 1,578,392.21/1,362.70
6. Step 6: Final answer
   x = 1,158.28