Finding the Fourth Proportional to 1,072.67, 1,610.15 and 814.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.67 : 1,610.15 = 814.34 : x
2. Step 2: Convert to fraction form
   1,072.67/1,610.15 = 814.34/x
3. Step 3: Cross multiply
   1,072.67x = 1,610.15 × 814.34
4. Step 4: Simplify right side
   1,072.67x = 1,311,209.50
5. Step 5: Solve for x
   x = 1,311,209.50/1,072.67
6. Step 6: Final answer
   x = 1,222.38