Finding the Fourth Proportional to 83,922.69, 125,670.20 and 81,429.51

Step by Step Solution

1. Step 1: Write the proportion equation
   83,922.69 : 125,670.20 = 81,429.51 : x
2. Step 2: Convert to fraction form
   83,922.69/125,670.20 = 81,429.51/x
3. Step 3: Cross multiply
   83,922.69x = 125,670.20 × 81,429.51
4. Step 4: Simplify right side
   83,922.69x = 10,233,262,400.45
5. Step 5: Solve for x
   x = 10,233,262,400.45/83,922.69
6. Step 6: Final answer
   x = 121,936.78