Finding the Fourth Proportional to 42,865.25, 64,287.54 and 16,553.21

Step by Step Solution

1. Step 1: Write the proportion equation
   42,865.25 : 64,287.54 = 16,553.21 : x
2. Step 2: Convert to fraction form
   42,865.25/64,287.54 = 16,553.21/x
3. Step 3: Cross multiply
   42,865.25x = 64,287.54 × 16,553.21
4. Step 4: Simplify right side
   42,865.25x = 1,064,164,828.57
5. Step 5: Solve for x
   x = 1,064,164,828.57/42,865.25
6. Step 6: Final answer
   x = 24,825.82