Finding the Fourth Proportional to 1,158.89, 1,738.76 and 542.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.89 : 1,738.76 = 542.79 : x
2. Step 2: Convert to fraction form
   1,158.89/1,738.76 = 542.79/x
3. Step 3: Cross multiply
   1,158.89x = 1,738.76 × 542.79
4. Step 4: Simplify right side
   1,158.89x = 943,778.83
5. Step 5: Solve for x
   x = 943,778.83/1,158.89
6. Step 6: Final answer
   x = 814.39