Finding the Fourth Proportional to 72,419.52, 99,789.12 and 58,215.36

Step by Step Solution

1. Step 1: Write the proportion equation
   72,419.52 : 99,789.12 = 58,215.36 : x
2. Step 2: Convert to fraction form
   72,419.52/99,789.12 = 58,215.36/x
3. Step 3: Cross multiply
   72,419.52x = 99,789.12 × 58,215.36
4. Step 4: Simplify right side
   72,419.52x = 5,809,259,544.88
5. Step 5: Solve for x
   x = 5,809,259,544.88/72,419.52
6. Step 6: Final answer
   x = 80,216.76