Finding the Fourth Proportional to 15,869.96, 21,899.69 and 9,155.18

Step by Step Solution

1. Step 1: Write the proportion equation
   15,869.96 : 21,899.69 = 9,155.18 : x
2. Step 2: Convert to fraction form
   15,869.96/21,899.69 = 9,155.18/x
3. Step 3: Cross multiply
   15,869.96x = 21,899.69 × 9,155.18
4. Step 4: Simplify right side
   15,869.96x = 200,495,603.89
5. Step 5: Solve for x
   x = 200,495,603.89/15,869.96
6. Step 6: Final answer
   x = 12,633.66