Finding the Fourth Proportional to 2,642.01, 3,962.07 and 792.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.01 : 3,962.07 = 792.78 : x
2. Step 2: Convert to fraction form
   2,642.01/3,962.07 = 792.78/x
3. Step 3: Cross multiply
   2,642.01x = 3,962.07 × 792.78
4. Step 4: Simplify right side
   2,642.01x = 3,141,049.85
5. Step 5: Solve for x
   x = 3,141,049.85/2,642.01
6. Step 6: Final answer
   x = 1,188.89