Finding the Fourth Proportional to 42,919.89, 64,379.88 and 13,337.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,919.89 : 64,379.88 = 13,337.76 : x
2. Step 2: Convert to fraction form
   42,919.89/64,379.88 = 13,337.76/x
3. Step 3: Cross multiply
   42,919.89x = 64,379.88 × 13,337.76
4. Step 4: Simplify right side
   42,919.89x = 858,683,388.27
5. Step 5: Solve for x
   x = 858,683,388.27/42,919.89
6. Step 6: Final answer
   x = 20,006.65