Finding the Fourth Proportional to 2,091.34, 3,138.36 and 792.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.34 : 3,138.36 = 792.79 : x
2. Step 2: Convert to fraction form
   2,091.34/3,138.36 = 792.79/x
3. Step 3: Cross multiply
   2,091.34x = 3,138.36 × 792.79
4. Step 4: Simplify right side
   2,091.34x = 2,488,060.42
5. Step 5: Solve for x
   x = 2,488,060.42/2,091.34
6. Step 6: Final answer
   x = 1,189.70