Finding the Fourth Proportional to 2,280.72, 3,420.28 and 636.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.72 : 3,420.28 = 636.82 : x
2. Step 2: Convert to fraction form
   2,280.72/3,420.28 = 636.82/x
3. Step 3: Cross multiply
   2,280.72x = 3,420.28 × 636.82
4. Step 4: Simplify right side
   2,280.72x = 2,178,102.71
5. Step 5: Solve for x
   x = 2,178,102.71/2,280.72
6. Step 6: Final answer
   x = 955.01