Finding the Fourth Proportional to 1,192.66, 1,645.89 and 661.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.66 : 1,645.89 = 661.55 : x
2. Step 2: Convert to fraction form
   1,192.66/1,645.89 = 661.55/x
3. Step 3: Cross multiply
   1,192.66x = 1,645.89 × 661.55
4. Step 4: Simplify right side
   1,192.66x = 1,088,839.34
5. Step 5: Solve for x
   x = 1,088,839.34/1,192.66
6. Step 6: Final answer
   x = 912.95