Finding the Fourth Proportional to 13,887.50, 19,164.27 and 7,921.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,887.50 : 19,164.27 = 7,921.09 : x
2. Step 2: Convert to fraction form
   13,887.50/19,164.27 = 7,921.09/x
3. Step 3: Cross multiply
   13,887.50x = 19,164.27 × 7,921.09
4. Step 4: Simplify right side
   13,887.50x = 151,801,907.45
5. Step 5: Solve for x
   x = 151,801,907.45/13,887.50
6. Step 6: Final answer
   x = 10,930.83