Finding the Fourth Proportional to 42,979.94, 64,483.10 and 20,519.27

Step by Step Solution

1. Step 1: Write the proportion equation
   42,979.94 : 64,483.10 = 20,519.27 : x
2. Step 2: Convert to fraction form
   42,979.94/64,483.10 = 20,519.27/x
3. Step 3: Cross multiply
   42,979.94x = 64,483.10 × 20,519.27
4. Step 4: Simplify right side
   42,979.94x = 1,323,145,714.33
5. Step 5: Solve for x
   x = 1,323,145,714.33/42,979.94
6. Step 6: Final answer
   x = 30,785.20