Finding the Fourth Proportional to 15,868.48, 21,903.33 and 9,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,868.48 : 21,903.33 = 9,158.50 : x
2. Step 2: Convert to fraction form
   15,868.48/21,903.33 = 9,158.50/x
3. Step 3: Cross multiply
   15,868.48x = 21,903.33 × 9,158.50
4. Step 4: Simplify right side
   15,868.48x = 200,601,538.29
5. Step 5: Solve for x
   x = 200,601,538.29/15,868.48
6. Step 6: Final answer
   x = 12,641.51