Finding the Fourth Proportional to 81,396.91, 122,109.15 and 28,074.41

Step by Step Solution

1. Step 1: Write the proportion equation
   81,396.91 : 122,109.15 = 28,074.41 : x
2. Step 2: Convert to fraction form
   81,396.91/122,109.15 = 28,074.41/x
3. Step 3: Cross multiply
   81,396.91x = 122,109.15 × 28,074.41
4. Step 4: Simplify right side
   81,396.91x = 3,428,142,341.85
5. Step 5: Solve for x
   x = 3,428,142,341.85/81,396.91
6. Step 6: Final answer
   x = 42,116.37