Finding the Fourth Proportional to 1,281.83, 1,769.06 and 839.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.83 : 1,769.06 = 839.98 : x
2. Step 2: Convert to fraction form
   1,281.83/1,769.06 = 839.98/x
3. Step 3: Cross multiply
   1,281.83x = 1,769.06 × 839.98
4. Step 4: Simplify right side
   1,281.83x = 1,485,975.02
5. Step 5: Solve for x
   x = 1,485,975.02/1,281.83
6. Step 6: Final answer
   x = 1,159.26