Finding the Fourth Proportional to 42,904.72, 64,372.47 and 19,210.33

Step by Step Solution

1. Step 1: Write the proportion equation
   42,904.72 : 64,372.47 = 19,210.33 : x
2. Step 2: Convert to fraction form
   42,904.72/64,372.47 = 19,210.33/x
3. Step 3: Cross multiply
   42,904.72x = 64,372.47 × 19,210.33
4. Step 4: Simplify right side
   42,904.72x = 1,236,616,391.62
5. Step 5: Solve for x
   x = 1,236,616,391.62/42,904.72
6. Step 6: Final answer
   x = 28,822.39