Finding the Fourth Proportional to 2,640.91, 3,961.14 and 792.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.91 : 3,961.14 = 792.45 : x
2. Step 2: Convert to fraction form
   2,640.91/3,961.14 = 792.45/x
3. Step 3: Cross multiply
   2,640.91x = 3,961.14 × 792.45
4. Step 4: Simplify right side
   2,640.91x = 3,139,005.39
5. Step 5: Solve for x
   x = 3,139,005.39/2,640.91
6. Step 6: Final answer
   x = 1,188.61