Finding the Fourth Proportional to 13,887.72, 19,165.90 and 7,920.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,887.72 : 19,165.90 = 7,920.54 : x
2. Step 2: Convert to fraction form
   13,887.72/19,165.90 = 7,920.54/x
3. Step 3: Cross multiply
   13,887.72x = 19,165.90 × 7,920.54
4. Step 4: Simplify right side
   13,887.72x = 151,804,277.59
5. Step 5: Solve for x
   x = 151,804,277.59/13,887.72
6. Step 6: Final answer
   x = 10,930.83