Finding the Fourth Proportional to 1,185.84, 1,636.54 and 661.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.84 : 1,636.54 = 661.86 : x
2. Step 2: Convert to fraction form
   1,185.84/1,636.54 = 661.86/x
3. Step 3: Cross multiply
   1,185.84x = 1,636.54 × 661.86
4. Step 4: Simplify right side
   1,185.84x = 1,083,160.36
5. Step 5: Solve for x
   x = 1,083,160.36/1,185.84
6. Step 6: Final answer
   x = 913.41