Finding the Fourth Proportional to 43,211.69, 64,819.58 and 20,998.61

Step by Step Solution

1. Step 1: Write the proportion equation
   43,211.69 : 64,819.58 = 20,998.61 : x
2. Step 2: Convert to fraction form
   43,211.69/64,819.58 = 20,998.61/x
3. Step 3: Cross multiply
   43,211.69x = 64,819.58 × 20,998.61
4. Step 4: Simplify right side
   43,211.69x = 1,361,120,651.69
5. Step 5: Solve for x
   x = 1,361,120,651.69/43,211.69
6. Step 6: Final answer
   x = 31,498.90