Finding the Fourth Proportional to 42,912.34, 64,367.68 and 13,329.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,912.34 : 64,367.68 = 13,329.52 : x
2. Step 2: Convert to fraction form
   42,912.34/64,367.68 = 13,329.52/x
3. Step 3: Cross multiply
   42,912.34x = 64,367.68 × 13,329.52
4. Step 4: Simplify right side
   42,912.34x = 857,990,277.91
5. Step 5: Solve for x
   x = 857,990,277.91/42,912.34
6. Step 6: Final answer
   x = 19,994.02