Finding the Fourth Proportional to 5,426.83, 8,142.78 and 1,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,426.83 : 8,142.78 = 1,919.50 : x
2. Step 2: Convert to fraction form
   5,426.83/8,142.78 = 1,919.50/x
3. Step 3: Cross multiply
   5,426.83x = 8,142.78 × 1,919.50
4. Step 4: Simplify right side
   5,426.83x = 15,630,066.21
5. Step 5: Solve for x
   x = 15,630,066.21/5,426.83
6. Step 6: Final answer
   x = 2,880.15