Finding the Fourth Proportional to 81,100.82, 111,918.01 and 47,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,100.82 : 111,918.01 = 47,128.50 : x
2. Step 2: Convert to fraction form
   81,100.82/111,918.01 = 47,128.50/x
3. Step 3: Cross multiply
   81,100.82x = 111,918.01 × 47,128.50
4. Step 4: Simplify right side
   81,100.82x = 5,274,527,934.29
5. Step 5: Solve for x
   x = 5,274,527,934.29/81,100.82
6. Step 6: Final answer
   x = 65,036.68