Finding the Fourth Proportional to 15,868.37, 21,897.51 and 9,153.60

Step by Step Solution

1. Step 1: Write the proportion equation
   15,868.37 : 21,897.51 = 9,153.60 : x
2. Step 2: Convert to fraction form
   15,868.37/21,897.51 = 9,153.60/x
3. Step 3: Cross multiply
   15,868.37x = 21,897.51 × 9,153.60
4. Step 4: Simplify right side
   15,868.37x = 200,441,001.77
5. Step 5: Solve for x
   x = 200,441,001.77/15,868.37
6. Step 6: Final answer
   x = 12,631.48