Finding the Fourth Proportional to 1,158.34, 1,600.59 and 911.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.34 : 1,600.59 = 911.56 : x
2. Step 2: Convert to fraction form
   1,158.34/1,600.59 = 911.56/x
3. Step 3: Cross multiply
   1,158.34x = 1,600.59 × 911.56
4. Step 4: Simplify right side
   1,158.34x = 1,459,033.82
5. Step 5: Solve for x
   x = 1,459,033.82/1,158.34
6. Step 6: Final answer
   x = 1,259.59