Finding the Fourth Proportional to 11,666.51, 16,107.71 and 8,972.96

Step by Step Solution

1. Step 1: Write the proportion equation
   11,666.51 : 16,107.71 = 8,972.96 : x
2. Step 2: Convert to fraction form
   11,666.51/16,107.71 = 8,972.96/x
3. Step 3: Cross multiply
   11,666.51x = 16,107.71 × 8,972.96
4. Step 4: Simplify right side
   11,666.51x = 144,533,837.52
5. Step 5: Solve for x
   x = 144,533,837.52/11,666.51
6. Step 6: Final answer
   x = 12,388.78