Finding the Fourth Proportional to 42,683.42, 64,063.86 and 21,638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,683.42 : 64,063.86 = 21,638.10 : x
2. Step 2: Convert to fraction form
   42,683.42/64,063.86 = 21,638.10/x
3. Step 3: Cross multiply
   42,683.42x = 64,063.86 × 21,638.10
4. Step 4: Simplify right side
   42,683.42x = 1,386,220,209.07
5. Step 5: Solve for x
   x = 1,386,220,209.07/42,683.42
6. Step 6: Final answer
   x = 32,476.78