Finding the Fourth Proportional to 76,672.78, 105,811.55 and 42,679.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76,672.78 : 105,811.55 = 42,679.12 : x
2. Step 2: Convert to fraction form
   76,672.78/105,811.55 = 42,679.12/x
3. Step 3: Cross multiply
   76,672.78x = 105,811.55 × 42,679.12
4. Step 4: Simplify right side
   76,672.78x = 4,515,943,839.84
5. Step 5: Solve for x
   x = 4,515,943,839.84/76,672.78
6. Step 6: Final answer
   x = 58,898.92