Finding the Fourth Proportional to 12,665.71, 18,988.91 and 7,667.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.71 : 18,988.91 = 7,667.02 : x
2. Step 2: Convert to fraction form
   12,665.71/18,988.91 = 7,667.02/x
3. Step 3: Cross multiply
   12,665.71x = 18,988.91 × 7,667.02
4. Step 4: Simplify right side
   12,665.71x = 145,588,219.47
5. Step 5: Solve for x
   x = 145,588,219.47/12,665.71
6. Step 6: Final answer
   x = 11,494.68