Finding the Fourth Proportional to 1,243.31, 1,715.78 and 719.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.31 : 1,715.78 = 719.35 : x
2. Step 2: Convert to fraction form
   1,243.31/1,715.78 = 719.35/x
3. Step 3: Cross multiply
   1,243.31x = 1,715.78 × 719.35
4. Step 4: Simplify right side
   1,243.31x = 1,234,238.46
5. Step 5: Solve for x
   x = 1,234,238.46/1,243.31
6. Step 6: Final answer
   x = 992.70