Finding the Fourth Proportional to 1,110.89, 1,665.05 and 836.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,110.89 : 1,665.05 = 836.10 : x
2. Step 2: Convert to fraction form
   1,110.89/1,665.05 = 836.10/x
3. Step 3: Cross multiply
   1,110.89x = 1,665.05 × 836.10
4. Step 4: Simplify right side
   1,110.89x = 1,392,144.12
5. Step 5: Solve for x
   x = 1,392,144.12/1,110.89
6. Step 6: Final answer
   x = 1,253.18