Finding the Fourth Proportional to 1,111.32, 1,664.90 and 835.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.32 : 1,664.90 = 835.80 : x
2. Step 2: Convert to fraction form
   1,111.32/1,664.90 = 835.80/x
3. Step 3: Cross multiply
   1,111.32x = 1,664.90 × 835.80
4. Step 4: Simplify right side
   1,111.32x = 1,391,523.42
5. Step 5: Solve for x
   x = 1,391,523.42/1,111.32
6. Step 6: Final answer
   x = 1,252.14