Finding the Fourth Proportional to 1,919.01, 2,650.05 and 1,815.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.01 : 2,650.05 = 1,815.47 : x
2. Step 2: Convert to fraction form
   1,919.01/2,650.05 = 1,815.47/x
3. Step 3: Cross multiply
   1,919.01x = 2,650.05 × 1,815.47
4. Step 4: Simplify right side
   1,919.01x = 4,811,086.27
5. Step 5: Solve for x
   x = 4,811,086.27/1,919.01
6. Step 6: Final answer
   x = 2,507.07