Finding the Fourth Proportional to 42,876.24, 64,336.30 and 20,412.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,876.24 : 64,336.30 = 20,412.34 : x
2. Step 2: Convert to fraction form
   42,876.24/64,336.30 = 20,412.34/x
3. Step 3: Cross multiply
   42,876.24x = 64,336.30 × 20,412.34
4. Step 4: Simplify right side
   42,876.24x = 1,313,254,429.94
5. Step 5: Solve for x
   x = 1,313,254,429.94/42,876.24
6. Step 6: Final answer
   x = 30,628.96