Finding the Fourth Proportional to 1,159.23, 1,599.94 and 661.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,159.23 : 1,599.94 = 661.91 : x
2. Step 2: Convert to fraction form
   1,159.23/1,599.94 = 661.91/x
3. Step 3: Cross multiply
   1,159.23x = 1,599.94 × 661.91
4. Step 4: Simplify right side
   1,159.23x = 1,059,016.29
5. Step 5: Solve for x
   x = 1,059,016.29/1,159.23
6. Step 6: Final answer
   x = 913.55