Finding the Fourth Proportional to 42,705.43, 64,097.34 and 21,660.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,705.43 : 64,097.34 = 21,660.12 : x
2. Step 2: Convert to fraction form
   42,705.43/64,097.34 = 21,660.12/x
3. Step 3: Cross multiply
   42,705.43x = 64,097.34 × 21,660.12
4. Step 4: Simplify right side
   42,705.43x = 1,388,355,967.78
5. Step 5: Solve for x
   x = 1,388,355,967.78/42,705.43
6. Step 6: Final answer
   x = 32,510.06