Finding the Fourth Proportional to 39,861.10, 55,010.81 and 21,956.10

Step by Step Solution

1. Step 1: Write the proportion equation
   39,861.10 : 55,010.81 = 21,956.10 : x
2. Step 2: Convert to fraction form
   39,861.10/55,010.81 = 21,956.10/x
3. Step 3: Cross multiply
   39,861.10x = 55,010.81 × 21,956.10
4. Step 4: Simplify right side
   39,861.10x = 1,207,822,694.04
5. Step 5: Solve for x
   x = 1,207,822,694.04/39,861.10
6. Step 6: Final answer
   x = 30,300.79