Finding the Fourth Proportional to 72,418.58, 99,937.38 and 42,221.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,418.58 : 99,937.38 = 42,221.78 : x
2. Step 2: Convert to fraction form
   72,418.58/99,937.38 = 42,221.78/x
3. Step 3: Cross multiply
   72,418.58x = 99,937.38 × 42,221.78
4. Step 4: Simplify right side
   72,418.58x = 4,219,534,072.14
5. Step 5: Solve for x
   x = 4,219,534,072.14/72,418.58
6. Step 6: Final answer
   x = 58,265.90