Finding the Fourth Proportional to 1,192.71, 1,645.91 and 661.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.71 : 1,645.91 = 661.59 : x
2. Step 2: Convert to fraction form
   1,192.71/1,645.91 = 661.59/x
3. Step 3: Cross multiply
   1,192.71x = 1,645.91 × 661.59
4. Step 4: Simplify right side
   1,192.71x = 1,088,914.29
5. Step 5: Solve for x
   x = 1,088,914.29/1,192.71
6. Step 6: Final answer
   x = 912.97