Finding the Fourth Proportional to 1,012.17, 1,519.37 and 647.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.17 : 1,519.37 = 647.27 : x
2. Step 2: Convert to fraction form
   1,012.17/1,519.37 = 647.27/x
3. Step 3: Cross multiply
   1,012.17x = 1,519.37 × 647.27
4. Step 4: Simplify right side
   1,012.17x = 983,442.62
5. Step 5: Solve for x
   x = 983,442.62/1,012.17
6. Step 6: Final answer
   x = 971.62