Finding the Fourth Proportional to 72,412.53, 99,940.89 and 42,215.54

Step by Step Solution

1. Step 1: Write the proportion equation
   72,412.53 : 99,940.89 = 42,215.54 : x
2. Step 2: Convert to fraction form
   72,412.53/99,940.89 = 42,215.54/x
3. Step 3: Cross multiply
   72,412.53x = 99,940.89 × 42,215.54
4. Step 4: Simplify right side
   72,412.53x = 4,219,058,139.73
5. Step 5: Solve for x
   x = 4,219,058,139.73/72,412.53
6. Step 6: Final answer
   x = 58,264.20