Finding the Fourth Proportional to 1,110.72, 1,665.93 and 648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,110.72 : 1,665.93 = 648.72 : x
2. Step 2: Convert to fraction form
   1,110.72/1,665.93 = 648.72/x
3. Step 3: Cross multiply
   1,110.72x = 1,665.93 × 648.72
4. Step 4: Simplify right side
   1,110.72x = 1,080,722.11
5. Step 5: Solve for x
   x = 1,080,722.11/1,110.72
6. Step 6: Final answer
   x = 972.99