Finding the Fourth Proportional to 105,679.55, 145,846.98 and 57,942

Step by Step Solution

1. Step 1: Write the proportion equation
   105,679.55 : 145,846.98 = 57,942 : x
2. Step 2: Convert to fraction form
   105,679.55/145,846.98 = 57,942/x
3. Step 3: Cross multiply
   105,679.55x = 145,846.98 × 57,942
4. Step 4: Simplify right side
   105,679.55x = 8,450,665,715.16
5. Step 5: Solve for x
   x = 8,450,665,715.16/105,679.55
6. Step 6: Final answer
   x = 79,965.00