Finding the Fourth Proportional to 28,196.94, 38,910.20 and 15,447.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,196.94 : 38,910.20 = 15,447.72 : x
2. Step 2: Convert to fraction form
   28,196.94/38,910.20 = 15,447.72/x
3. Step 3: Cross multiply
   28,196.94x = 38,910.20 × 15,447.72
4. Step 4: Simplify right side
   28,196.94x = 601,073,874.74
5. Step 5: Solve for x
   x = 601,073,874.74/28,196.94
6. Step 6: Final answer
   x = 21,316.99