Finding the Fourth Proportional to 13,887.89, 19,164.81 and 7,921.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,887.89 : 19,164.81 = 7,921.48 : x
2. Step 2: Convert to fraction form
   13,887.89/19,164.81 = 7,921.48/x
3. Step 3: Cross multiply
   13,887.89x = 19,164.81 × 7,921.48
4. Step 4: Simplify right side
   13,887.89x = 151,813,659.12
5. Step 5: Solve for x
   x = 151,813,659.12/13,887.89
6. Step 6: Final answer
   x = 10,931.37