Finding the Fourth Proportional to 11,787.96, 17,643.48 and 8,667.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,787.96 : 17,643.48 = 8,667.12 : x
2. Step 2: Convert to fraction form
   11,787.96/17,643.48 = 8,667.12/x
3. Step 3: Cross multiply
   11,787.96x = 17,643.48 × 8,667.12
4. Step 4: Simplify right side
   11,787.96x = 152,918,158.38
5. Step 5: Solve for x
   x = 152,918,158.38/11,787.96
6. Step 6: Final answer
   x = 12,972.40