Finding the Fourth Proportional to 42,763.36, 64,101.30 and 21,664.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,763.36 : 64,101.30 = 21,664.30 : x
2. Step 2: Convert to fraction form
   42,763.36/64,101.30 = 21,664.30/x
3. Step 3: Cross multiply
   42,763.36x = 64,101.30 × 21,664.30
4. Step 4: Simplify right side
   42,763.36x = 1,388,709,793.59
5. Step 5: Solve for x
   x = 1,388,709,793.59/42,763.36
6. Step 6: Final answer
   x = 32,474.29