Finding the Fourth Proportional to 1,060.32, 1,462.89 and 640.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.32 : 1,462.89 = 640.80 : x
2. Step 2: Convert to fraction form
   1,060.32/1,462.89 = 640.80/x
3. Step 3: Cross multiply
   1,060.32x = 1,462.89 × 640.80
4. Step 4: Simplify right side
   1,060.32x = 937,419.91
5. Step 5: Solve for x
   x = 937,419.91/1,060.32
6. Step 6: Final answer
   x = 884.09