Finding the Fourth Proportional to 42,638.71, 63,958.22 and 13,056.43

Step by Step Solution

1. Step 1: Write the proportion equation
   42,638.71 : 63,958.22 = 13,056.43 : x
2. Step 2: Convert to fraction form
   42,638.71/63,958.22 = 13,056.43/x
3. Step 3: Cross multiply
   42,638.71x = 63,958.22 × 13,056.43
4. Step 4: Simplify right side
   42,638.71x = 835,065,702.56
5. Step 5: Solve for x
   x = 835,065,702.56/42,638.71
6. Step 6: Final answer
   x = 19,584.68