Finding the Fourth Proportional to 42,135.52, 63,221.72 and 19,964.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,135.52 : 63,221.72 = 19,964.72 : x
2. Step 2: Convert to fraction form
   42,135.52/63,221.72 = 19,964.72/x
3. Step 3: Cross multiply
   42,135.52x = 63,221.72 × 19,964.72
4. Step 4: Simplify right side
   42,135.52x = 1,262,203,937.72
5. Step 5: Solve for x
   x = 1,262,203,937.72/42,135.52
6. Step 6: Final answer
   x = 29,955.82