Finding the Fourth Proportional to 76,212.88, 105,173.56 and 42,221.42

Step by Step Solution

1. Step 1: Write the proportion equation
   76,212.88 : 105,173.56 = 42,221.42 : x
2. Step 2: Convert to fraction form
   76,212.88/105,173.56 = 42,221.42/x
3. Step 3: Cross multiply
   76,212.88x = 105,173.56 × 42,221.42
4. Step 4: Simplify right side
   76,212.88x = 4,440,577,049.66
5. Step 5: Solve for x
   x = 4,440,577,049.66/76,212.88
6. Step 6: Final answer
   x = 58,265.44