Finding the Fourth Proportional to 1,109.48, 1,663.67 and 647.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.48 : 1,663.67 = 647.38 : x
2. Step 2: Convert to fraction form
   1,109.48/1,663.67 = 647.38/x
3. Step 3: Cross multiply
   1,109.48x = 1,663.67 × 647.38
4. Step 4: Simplify right side
   1,109.48x = 1,077,017.38
5. Step 5: Solve for x
   x = 1,077,017.38/1,109.48
6. Step 6: Final answer
   x = 970.74