Finding the Fourth Proportional to 42,920.96, 64,387.32 and 13,333.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,920.96 : 64,387.32 = 13,333.28 : x
2. Step 2: Convert to fraction form
   42,920.96/64,387.32 = 13,333.28/x
3. Step 3: Cross multiply
   42,920.96x = 64,387.32 × 13,333.28
4. Step 4: Simplify right side
   42,920.96x = 858,494,166.01
5. Step 5: Solve for x
   x = 858,494,166.01/42,920.96
6. Step 6: Final answer
   x = 20,001.75