Finding the Fourth Proportional to 15,492.98, 21,380.55 and 8,419.41

Step by Step Solution

1. Step 1: Write the proportion equation
   15,492.98 : 21,380.55 = 8,419.41 : x
2. Step 2: Convert to fraction form
   15,492.98/21,380.55 = 8,419.41/x
3. Step 3: Cross multiply
   15,492.98x = 21,380.55 × 8,419.41
4. Step 4: Simplify right side
   15,492.98x = 180,011,584.90
5. Step 5: Solve for x
   x = 180,011,584.90/15,492.98
6. Step 6: Final answer
   x = 11,618.91