Finding the Fourth Proportional to 51,196.70, 76,665.45 and 40,828.70

Step by Step Solution

1. Step 1: Write the proportion equation
   51,196.70 : 76,665.45 = 40,828.70 : x
2. Step 2: Convert to fraction form
   51,196.70/76,665.45 = 40,828.70/x
3. Step 3: Cross multiply
   51,196.70x = 76,665.45 × 40,828.70
4. Step 4: Simplify right side
   51,196.70x = 3,130,150,658.42
5. Step 5: Solve for x
   x = 3,130,150,658.42/51,196.70
6. Step 6: Final answer
   x = 61,139.70