Finding the Fourth Proportional to 99,016.42, 136,640.20 and 56,571.34

Step by Step Solution

1. Step 1: Write the proportion equation
   99,016.42 : 136,640.20 = 56,571.34 : x
2. Step 2: Convert to fraction form
   99,016.42/136,640.20 = 56,571.34/x
3. Step 3: Cross multiply
   99,016.42x = 136,640.20 × 56,571.34
4. Step 4: Simplify right side
   99,016.42x = 7,729,919,211.87
5. Step 5: Solve for x
   x = 7,729,919,211.87/99,016.42
6. Step 6: Final answer
   x = 78,067.04