Finding the Fourth Proportional to 1,072.31, 1,609.50 and 762.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.31 : 1,609.50 = 762.72 : x
2. Step 2: Convert to fraction form
   1,072.31/1,609.50 = 762.72/x
3. Step 3: Cross multiply
   1,072.31x = 1,609.50 × 762.72
4. Step 4: Simplify right side
   1,072.31x = 1,227,588.23
5. Step 5: Solve for x
   x = 1,227,588.23/1,072.31
6. Step 6: Final answer
   x = 1,144.80