Finding the Fourth Proportional to 42,921.96, 64,388.82 and 13,334.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,921.96 : 64,388.82 = 13,334.28 : x
2. Step 2: Convert to fraction form
   42,921.96/64,388.82 = 13,334.28/x
3. Step 3: Cross multiply
   42,921.96x = 64,388.82 × 13,334.28
4. Step 4: Simplify right side
   42,921.96x = 858,578,554.75
5. Step 5: Solve for x
   x = 858,578,554.75/42,921.96
6. Step 6: Final answer
   x = 20,003.25