Finding the Fourth Proportional to 15,522.91, 21,428.89 and 9,147.53

Step by Step Solution

1. Step 1: Write the proportion equation
   15,522.91 : 21,428.89 = 9,147.53 : x
2. Step 2: Convert to fraction form
   15,522.91/21,428.89 = 9,147.53/x
3. Step 3: Cross multiply
   15,522.91x = 21,428.89 × 9,147.53
4. Step 4: Simplify right side
   15,522.91x = 196,021,444.85
5. Step 5: Solve for x
   x = 196,021,444.85/15,522.91
6. Step 6: Final answer
   x = 12,627.88