Finding the Fourth Proportional to 72,408.22, 99,921.72 and 42,191.66

Step by Step Solution

1. Step 1: Write the proportion equation
   72,408.22 : 99,921.72 = 42,191.66 : x
2. Step 2: Convert to fraction form
   72,408.22/99,921.72 = 42,191.66/x
3. Step 3: Cross multiply
   72,408.22x = 99,921.72 × 42,191.66
4. Step 4: Simplify right side
   72,408.22x = 4,215,863,236.86
5. Step 5: Solve for x
   x = 4,215,863,236.86/72,408.22
6. Step 6: Final answer
   x = 58,223.54