Finding the Fourth Proportional to 76,709.12, 105,857.40 and 42,716.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,709.12 : 105,857.40 = 42,716.72 : x
2. Step 2: Convert to fraction form
   76,709.12/105,857.40 = 42,716.72/x
3. Step 3: Cross multiply
   76,709.12x = 105,857.40 × 42,716.72
4. Step 4: Simplify right side
   76,709.12x = 4,521,880,915.73
5. Step 5: Solve for x
   x = 4,521,880,915.73/76,709.12
6. Step 6: Final answer
   x = 58,948.41