Finding the Fourth Proportional to 99,441.16, 137,231.94 and 57,013

Step by Step Solution

1. Step 1: Write the proportion equation
   99,441.16 : 137,231.94 = 57,013 : x
2. Step 2: Convert to fraction form
   99,441.16/137,231.94 = 57,013/x
3. Step 3: Cross multiply
   99,441.16x = 137,231.94 × 57,013
4. Step 4: Simplify right side
   99,441.16x = 7,824,004,595.22
5. Step 5: Solve for x
   x = 7,824,004,595.22/99,441.16
6. Step 6: Final answer
   x = 78,679.74