Finding the Fourth Proportional to 39,490, 54,496.20 and 21,826

Step by Step Solution

1. Step 1: Write the proportion equation
   39,490 : 54,496.20 = 21,826 : x
2. Step 2: Convert to fraction form
   39,490/54,496.20 = 21,826/x
3. Step 3: Cross multiply
   39,490x = 54,496.20 × 21,826
4. Step 4: Simplify right side
   39,490x = 1,189,434,061.20
5. Step 5: Solve for x
   x = 1,189,434,061.20/39,490
6. Step 6: Final answer
   x = 30,119.88