Finding the Fourth Proportional to 116,770, 161,142.78 and 66,469

Step by Step Solution

1. Step 1: Write the proportion equation
   116,770 : 161,142.78 = 66,469 : x
2. Step 2: Convert to fraction form
   116,770/161,142.78 = 66,469/x
3. Step 3: Cross multiply
   116,770x = 161,142.78 × 66,469
4. Step 4: Simplify right side
   116,770x = 10,710,999,443.82
5. Step 5: Solve for x
   x = 10,710,999,443.82/116,770
6. Step 6: Final answer
   x = 91,727.32