Finding the Fourth Proportional to 1,186.20, 1,636.72 and 662.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,186.20 : 1,636.72 = 662.16 : x
2. Step 2: Convert to fraction form
   1,186.20/1,636.72 = 662.16/x
3. Step 3: Cross multiply
   1,186.20x = 1,636.72 × 662.16
4. Step 4: Simplify right side
   1,186.20x = 1,083,770.52
5. Step 5: Solve for x
   x = 1,083,770.52/1,186.20
6. Step 6: Final answer
   x = 913.65