Finding the Fourth Proportional to 113,920.16, 157,196.31 and 66,165.80

Step by Step Solution

1. Step 1: Write the proportion equation
   113,920.16 : 157,196.31 = 66,165.80 : x
2. Step 2: Convert to fraction form
   113,920.16/157,196.31 = 66,165.80/x
3. Step 3: Cross multiply
   113,920.16x = 157,196.31 × 66,165.80
4. Step 4: Simplify right side
   113,920.16x = 10,401,019,608.20
5. Step 5: Solve for x
   x = 10,401,019,608.20/113,920.16
6. Step 6: Final answer
   x = 91,300.96