Finding the Fourth Proportional to 1,068.72, 1,600.80 and 657.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.72 : 1,600.80 = 657.96 : x
2. Step 2: Convert to fraction form
   1,068.72/1,600.80 = 657.96/x
3. Step 3: Cross multiply
   1,068.72x = 1,600.80 × 657.96
4. Step 4: Simplify right side
   1,068.72x = 1,053,262.37
5. Step 5: Solve for x
   x = 1,053,262.37/1,068.72
6. Step 6: Final answer
   x = 985.54