Finding the Fourth Proportional to 1,158.79, 1,729.72 and 1,061.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.79 : 1,729.72 = 1,061.59 : x
2. Step 2: Convert to fraction form
   1,158.79/1,729.72 = 1,061.59/x
3. Step 3: Cross multiply
   1,158.79x = 1,729.72 × 1,061.59
4. Step 4: Simplify right side
   1,158.79x = 1,836,253.45
5. Step 5: Solve for x
   x = 1,836,253.45/1,158.79
6. Step 6: Final answer
   x = 1,584.63