Finding the Fourth Proportional to 2,638.38, 3,956.30 and 788.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.38 : 3,956.30 = 788.84 : x
2. Step 2: Convert to fraction form
   2,638.38/3,956.30 = 788.84/x
3. Step 3: Cross multiply
   2,638.38x = 3,956.30 × 788.84
4. Step 4: Simplify right side
   2,638.38x = 3,120,887.69
5. Step 5: Solve for x
   x = 3,120,887.69/2,638.38
6. Step 6: Final answer
   x = 1,182.88