Finding the Fourth Proportional to 1,111.58, 1,666.80 and 649.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.58 : 1,666.80 = 649.47 : x
2. Step 2: Convert to fraction form
   1,111.58/1,666.80 = 649.47/x
3. Step 3: Cross multiply
   1,111.58x = 1,666.80 × 649.47
4. Step 4: Simplify right side
   1,111.58x = 1,082,536.60
5. Step 5: Solve for x
   x = 1,082,536.60/1,111.58
6. Step 6: Final answer
   x = 973.88