Finding the Fourth Proportional to 99,012.98, 136,647.41 and 56,563.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,012.98 : 136,647.41 = 56,563.31 : x
2. Step 2: Convert to fraction form
   99,012.98/136,647.41 = 56,563.31/x
3. Step 3: Cross multiply
   99,012.98x = 136,647.41 × 56,563.31
4. Step 4: Simplify right side
   99,012.98x = 7,729,229,871.33
5. Step 5: Solve for x
   x = 7,729,229,871.33/99,012.98
6. Step 6: Final answer
   x = 78,062.79