Finding the Fourth Proportional to 1,276.18, 1,761.01 and 716.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.18 : 1,761.01 = 716.67 : x
2. Step 2: Convert to fraction form
   1,276.18/1,761.01 = 716.67/x
3. Step 3: Cross multiply
   1,276.18x = 1,761.01 × 716.67
4. Step 4: Simplify right side
   1,276.18x = 1,262,061.25
5. Step 5: Solve for x
   x = 1,262,061.25/1,276.18
6. Step 6: Final answer
   x = 988.94