Finding the Fourth Proportional to 83,608.72, 125,409.78 and 21,280.84

Step by Step Solution

1. Step 1: Write the proportion equation
   83,608.72 : 125,409.78 = 21,280.84 : x
2. Step 2: Convert to fraction form
   83,608.72/125,409.78 = 21,280.84/x
3. Step 3: Cross multiply
   83,608.72x = 125,409.78 × 21,280.84
4. Step 4: Simplify right side
   83,608.72x = 2,668,825,462.62
5. Step 5: Solve for x
   x = 2,668,825,462.62/83,608.72
6. Step 6: Final answer
   x = 31,920.42