Finding the Fourth Proportional to 13,887.32, 19,164.56 and 7,919.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,887.32 : 19,164.56 = 7,919.10 : x
2. Step 2: Convert to fraction form
   13,887.32/19,164.56 = 7,919.10/x
3. Step 3: Cross multiply
   13,887.32x = 19,164.56 × 7,919.10
4. Step 4: Simplify right side
   13,887.32x = 151,766,027.50
5. Step 5: Solve for x
   x = 151,766,027.50/13,887.32
6. Step 6: Final answer
   x = 10,928.39