Finding the Fourth Proportional to 99,216.72, 136,921.56 and 54,504.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,216.72 : 136,921.56 = 54,504.72 : x
2. Step 2: Convert to fraction form
   99,216.72/136,921.56 = 54,504.72/x
3. Step 3: Cross multiply
   99,216.72x = 136,921.56 × 54,504.72
4. Step 4: Simplify right side
   99,216.72x = 7,462,871,289.76
5. Step 5: Solve for x
   x = 7,462,871,289.76/99,216.72
6. Step 6: Final answer
   x = 75,217.88