Finding the Fourth Proportional to 3,078.78, 4,620.20 and 1,131.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,078.78 : 4,620.20 = 1,131.00 : x
2. Step 2: Convert to fraction form
   3,078.78/4,620.20 = 1,131.00/x
3. Step 3: Cross multiply
   3,078.78x = 4,620.20 × 1,131.00
4. Step 4: Simplify right side
   3,078.78x = 5,225,457.75
5. Step 5: Solve for x
   x = 5,225,457.75/3,078.78
6. Step 6: Final answer
   x = 1,697.25