Finding the Fourth Proportional to 67,815, 101,722.52 and 21,067.88

Step by Step Solution

1. Step 1: Write the proportion equation
   67,815 : 101,722.52 = 21,067.88 : x
2. Step 2: Convert to fraction form
   67,815/101,722.52 = 21,067.88/x
3. Step 3: Cross multiply
   67,815x = 101,722.52 × 21,067.88
4. Step 4: Simplify right side
   67,815x = 2,143,077,844.66
5. Step 5: Solve for x
   x = 2,143,077,844.66/67,815
6. Step 6: Final answer
   x = 31,601.83