Finding the Fourth Proportional to 99,986.94, 138,016.73 and 57,562.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,986.94 : 138,016.73 = 57,562.38 : x
2. Step 2: Convert to fraction form
   99,986.94/138,016.73 = 57,562.38/x
3. Step 3: Cross multiply
   99,986.94x = 138,016.73 × 57,562.38
4. Step 4: Simplify right side
   99,986.94x = 7,944,571,170.81
5. Step 5: Solve for x
   x = 7,944,571,170.81/99,986.94
6. Step 6: Final answer
   x = 79,456.09