Finding the Fourth Proportional to 2,618.00, 3,923.52 and 1,921.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.00 : 3,923.52 = 1,921.40 : x
2. Step 2: Convert to fraction form
   2,618.00/3,923.52 = 1,921.40/x
3. Step 3: Cross multiply
   2,618.00x = 3,923.52 × 1,921.40
4. Step 4: Simplify right side
   2,618.00x = 7,538,672.10
5. Step 5: Solve for x
   x = 7,538,672.10/2,618.00
6. Step 6: Final answer
   x = 2,879.56