Finding the Fourth Proportional to 1,276.52, 1,761.56 and 716.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.52 : 1,761.56 = 716.99 : x
2. Step 2: Convert to fraction form
   1,276.52/1,761.56 = 716.99/x
3. Step 3: Cross multiply
   1,276.52x = 1,761.56 × 716.99
4. Step 4: Simplify right side
   1,276.52x = 1,263,008.51
5. Step 5: Solve for x
   x = 1,263,008.51/1,276.52
6. Step 6: Final answer
   x = 989.42