Finding the Fourth Proportional to 105,758.38, 145,946.78 and 58,012.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,758.38 : 145,946.78 = 58,012.12 : x
2. Step 2: Convert to fraction form
   105,758.38/145,946.78 = 58,012.12/x
3. Step 3: Cross multiply
   105,758.38x = 145,946.78 × 58,012.12
4. Step 4: Simplify right side
   105,758.38x = 8,466,682,114.97
5. Step 5: Solve for x
   x = 8,466,682,114.97/105,758.38
6. Step 6: Final answer
   x = 80,056.84