Finding the Fourth Proportional to 2,087.54, 3,130.34 and 788.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.54 : 3,130.34 = 788.18 : x
2. Step 2: Convert to fraction form
   2,087.54/3,130.34 = 788.18/x
3. Step 3: Cross multiply
   2,087.54x = 3,130.34 × 788.18
4. Step 4: Simplify right side
   2,087.54x = 2,467,271.38
5. Step 5: Solve for x
   x = 2,467,271.38/2,087.54
6. Step 6: Final answer
   x = 1,181.90