Finding the Fourth Proportional to 1,160.61, 1,601.10 and 718.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.61 : 1,601.10 = 718.35 : x
2. Step 2: Convert to fraction form
   1,160.61/1,601.10 = 718.35/x
3. Step 3: Cross multiply
   1,160.61x = 1,601.10 × 718.35
4. Step 4: Simplify right side
   1,160.61x = 1,150,150.19
5. Step 5: Solve for x
   x = 1,150,150.19/1,160.61
6. Step 6: Final answer
   x = 990.99