Finding the Fourth Proportional to 1,370.71, 1,890.77 and 839.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.71 : 1,890.77 = 839.83 : x
2. Step 2: Convert to fraction form
   1,370.71/1,890.77 = 839.83/x
3. Step 3: Cross multiply
   1,370.71x = 1,890.77 × 839.83
4. Step 4: Simplify right side
   1,370.71x = 1,587,925.01
5. Step 5: Solve for x
   x = 1,587,925.01/1,370.71
6. Step 6: Final answer
   x = 1,158.47