Finding the Fourth Proportional to 76,221, 105,184.78 and 42,229.55

Step by Step Solution

1. Step 1: Write the proportion equation
   76,221 : 105,184.78 = 42,229.55 : x
2. Step 2: Convert to fraction form
   76,221/105,184.78 = 42,229.55/x
3. Step 3: Cross multiply
   76,221x = 105,184.78 × 42,229.55
4. Step 4: Simplify right side
   76,221x = 4,441,906,083.64
5. Step 5: Solve for x
   x = 4,441,906,083.64/76,221
6. Step 6: Final answer
   x = 58,276.67