Finding the Fourth Proportional to 1,123.20, 1,548.86 and 680.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.20 : 1,548.86 = 680.99 : x
2. Step 2: Convert to fraction form
   1,123.20/1,548.86 = 680.99/x
3. Step 3: Cross multiply
   1,123.20x = 1,548.86 × 680.99
4. Step 4: Simplify right side
   1,123.20x = 1,054,747.02
5. Step 5: Solve for x
   x = 1,054,747.02/1,123.20
6. Step 6: Final answer
   x = 939.06