Finding the Fourth Proportional to 1,185.80, 1,636.36 and 661.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.80 : 1,636.36 = 661.84 : x
2. Step 2: Convert to fraction form
   1,185.80/1,636.36 = 661.84/x
3. Step 3: Cross multiply
   1,185.80x = 1,636.36 × 661.84
4. Step 4: Simplify right side
   1,185.80x = 1,083,008.50
5. Step 5: Solve for x
   x = 1,083,008.50/1,185.80
6. Step 6: Final answer
   x = 913.31