Finding the Fourth Proportional to 216,128.69, 324,208.61 and 83,008.94

Step by Step Solution

1. Step 1: Write the proportion equation
   216,128.69 : 324,208.61 = 83,008.94 : x
2. Step 2: Convert to fraction form
   216,128.69/324,208.61 = 83,008.94/x
3. Step 3: Cross multiply
   216,128.69x = 324,208.61 × 83,008.94
4. Step 4: Simplify right side
   216,128.69x = 26,912,211,018.89
5. Step 5: Solve for x
   x = 26,912,211,018.89/216,128.69
6. Step 6: Final answer
   x = 124,519.39