Finding the Fourth Proportional to 1,111.58, 1,666.45 and 648.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.58 : 1,666.45 = 648.22 : x
2. Step 2: Convert to fraction form
   1,111.58/1,666.45 = 648.22/x
3. Step 3: Cross multiply
   1,111.58x = 1,666.45 × 648.22
4. Step 4: Simplify right side
   1,111.58x = 1,080,226.22
5. Step 5: Solve for x
   x = 1,080,226.22/1,111.58
6. Step 6: Final answer
   x = 971.79