Finding the Fourth Proportional to 2,138.48, 2,956.12 and 1,522.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.48 : 2,956.12 = 1,522.80 : x
2. Step 2: Convert to fraction form
   2,138.48/2,956.12 = 1,522.80/x
3. Step 3: Cross multiply
   2,138.48x = 2,956.12 × 1,522.80
4. Step 4: Simplify right side
   2,138.48x = 4,501,579.54
5. Step 5: Solve for x
   x = 4,501,579.54/2,138.48
6. Step 6: Final answer
   x = 2,105.04