Finding the Fourth Proportional to 1,243.50, 1,715.61 and 719.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.50 : 1,715.61 = 719.34 : x
2. Step 2: Convert to fraction form
   1,243.50/1,715.61 = 719.34/x
3. Step 3: Cross multiply
   1,243.50x = 1,715.61 × 719.34
4. Step 4: Simplify right side
   1,243.50x = 1,234,106.90
5. Step 5: Solve for x
   x = 1,234,106.90/1,243.50
6. Step 6: Final answer
   x = 992.45