Finding the Fourth Proportional to 13,886.72, 19,164.52 and 7,919.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,886.72 : 19,164.52 = 7,919.54 : x
2. Step 2: Convert to fraction form
   13,886.72/19,164.52 = 7,919.54/x
3. Step 3: Cross multiply
   13,886.72x = 19,164.52 × 7,919.54
4. Step 4: Simplify right side
   13,886.72x = 151,774,182.72
5. Step 5: Solve for x
   x = 151,774,182.72/13,886.72
6. Step 6: Final answer
   x = 10,929.45