Finding the Fourth Proportional to 1,114.46, 1,667.91 and 839.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,114.46 : 1,667.91 = 839.86 : x
2. Step 2: Convert to fraction form
   1,114.46/1,667.91 = 839.86/x
3. Step 3: Cross multiply
   1,114.46x = 1,667.91 × 839.86
4. Step 4: Simplify right side
   1,114.46x = 1,400,810.89
5. Step 5: Solve for x
   x = 1,400,810.89/1,114.46
6. Step 6: Final answer
   x = 1,256.94