Finding the Fourth Proportional to 42,959.43, 64,406.73 and 28,172.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,959.43 : 64,406.73 = 28,172.07 : x
2. Step 2: Convert to fraction form
   42,959.43/64,406.73 = 28,172.07/x
3. Step 3: Cross multiply
   42,959.43x = 64,406.73 × 28,172.07
4. Step 4: Simplify right side
   42,959.43x = 1,814,470,906.03
5. Step 5: Solve for x
   x = 1,814,470,906.03/42,959.43
6. Step 6: Final answer
   x = 42,236.85