Finding the Fourth Proportional to 2,431.60, 3,647.98 and 788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,431.60 : 3,647.98 = 788.15 : x
2. Step 2: Convert to fraction form
   2,431.60/3,647.98 = 788.15/x
3. Step 3: Cross multiply
   2,431.60x = 3,647.98 × 788.15
4. Step 4: Simplify right side
   2,431.60x = 2,875,155.44
5. Step 5: Solve for x
   x = 2,875,155.44/2,431.60
6. Step 6: Final answer
   x = 1,182.41