Finding the Fourth Proportional to 42,680.42, 64,059.36 and 21,635.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,680.42 : 64,059.36 = 21,635.10 : x
2. Step 2: Convert to fraction form
   42,680.42/64,059.36 = 21,635.10/x
3. Step 3: Cross multiply
   42,680.42x = 64,059.36 × 21,635.10
4. Step 4: Simplify right side
   42,680.42x = 1,385,930,578.40
5. Step 5: Solve for x
   x = 1,385,930,578.40/42,680.42
6. Step 6: Final answer
   x = 32,472.28