Finding the Fourth Proportional to 1,123.84, 1,551.36 and 709.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.84 : 1,551.36 = 709.76 : x
2. Step 2: Convert to fraction form
   1,123.84/1,551.36 = 709.76/x
3. Step 3: Cross multiply
   1,123.84x = 1,551.36 × 709.76
4. Step 4: Simplify right side
   1,123.84x = 1,101,093.27
5. Step 5: Solve for x
   x = 1,101,093.27/1,123.84
6. Step 6: Final answer
   x = 979.76