Finding the Fourth Proportional to 15,699.96, 21,667.14 and 8,987.69

Step by Step Solution

1. Step 1: Write the proportion equation
   15,699.96 : 21,667.14 = 8,987.69 : x
2. Step 2: Convert to fraction form
   15,699.96/21,667.14 = 8,987.69/x
3. Step 3: Cross multiply
   15,699.96x = 21,667.14 × 8,987.69
4. Step 4: Simplify right side
   15,699.96x = 194,737,429.17
5. Step 5: Solve for x
   x = 194,737,429.17/15,699.96
6. Step 6: Final answer
   x = 12,403.69