Finding the Fourth Proportional to 42,638.96, 63,958.59 and 13,056.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,638.96 : 63,958.59 = 13,056.67 : x
2. Step 2: Convert to fraction form
   42,638.96/63,958.59 = 13,056.67/x
3. Step 3: Cross multiply
   42,638.96x = 63,958.59 × 13,056.67
4. Step 4: Simplify right side
   42,638.96x = 835,086,203.30
5. Step 5: Solve for x
   x = 835,086,203.30/42,638.96
6. Step 6: Final answer
   x = 19,585.05