Finding the Fourth Proportional to 81,940.20, 113,072.64 and 46,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   81,940.20 : 113,072.64 = 46,128.78 : x
2. Step 2: Convert to fraction form
   81,940.20/113,072.64 = 46,128.78/x
3. Step 3: Cross multiply
   81,940.20x = 113,072.64 × 46,128.78
4. Step 4: Simplify right side
   81,940.20x = 5,215,902,934.58
5. Step 5: Solve for x
   x = 5,215,902,934.58/81,940.20
6. Step 6: Final answer
   x = 63,654.99