Finding the Fourth Proportional to 81,665.29, 122,390.43 and 76,338.10

Step by Step Solution

1. Step 1: Write the proportion equation
   81,665.29 : 122,390.43 = 76,338.10 : x
2. Step 2: Convert to fraction form
   81,665.29/122,390.43 = 76,338.10/x
3. Step 3: Cross multiply
   81,665.29x = 122,390.43 × 76,338.10
4. Step 4: Simplify right side
   81,665.29x = 9,343,052,884.38
5. Step 5: Solve for x
   x = 9,343,052,884.38/81,665.29
6. Step 6: Final answer
   x = 114,406.66