Finding the Fourth Proportional to 11,912.51, 17,877.89 and 8,579.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,912.51 : 17,877.89 = 8,579.16 : x
2. Step 2: Convert to fraction form
   11,912.51/17,877.89 = 8,579.16/x
3. Step 3: Cross multiply
   11,912.51x = 17,877.89 × 8,579.16
4. Step 4: Simplify right side
   11,912.51x = 153,377,300.22
5. Step 5: Solve for x
   x = 153,377,300.22/11,912.51
6. Step 6: Final answer
   x = 12,875.31