Finding the Fourth Proportional to 72,420.52, 99,790.50 and 58,216.36

Step by Step Solution

1. Step 1: Write the proportion equation
   72,420.52 : 99,790.50 = 58,216.36 : x
2. Step 2: Convert to fraction form
   72,420.52/99,790.50 = 58,216.36/x
3. Step 3: Cross multiply
   72,420.52x = 99,790.50 × 58,216.36
4. Step 4: Simplify right side
   72,420.52x = 5,809,439,672.58
5. Step 5: Solve for x
   x = 5,809,439,672.58/72,420.52
6. Step 6: Final answer
   x = 80,218.14