Finding the Fourth Proportional to 1,111.11, 1,663.44 and 647.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.11 : 1,663.44 = 647.46 : x
2. Step 2: Convert to fraction form
   1,111.11/1,663.44 = 647.46/x
3. Step 3: Cross multiply
   1,111.11x = 1,663.44 × 647.46
4. Step 4: Simplify right side
   1,111.11x = 1,077,010.86
5. Step 5: Solve for x
   x = 1,077,010.86/1,111.11
6. Step 6: Final answer
   x = 969.31