Finding the Fourth Proportional to 42,801.75, 64,201.41 and 13,215.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,801.75 : 64,201.41 = 13,215.29 : x
2. Step 2: Convert to fraction form
   42,801.75/64,201.41 = 13,215.29/x
3. Step 3: Cross multiply
   42,801.75x = 64,201.41 × 13,215.29
4. Step 4: Simplify right side
   42,801.75x = 848,439,930.55
5. Step 5: Solve for x
   x = 848,439,930.55/42,801.75
6. Step 6: Final answer
   x = 19,822.55