Finding the Fourth Proportional to 142,653.88, 196,859.94 and 78,990.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,653.88 : 196,859.94 = 78,990.31 : x
2. Step 2: Convert to fraction form
   142,653.88/196,859.94 = 78,990.31/x
3. Step 3: Cross multiply
   142,653.88x = 196,859.94 × 78,990.31
4. Step 4: Simplify right side
   142,653.88x = 15,550,027,687.18
5. Step 5: Solve for x
   x = 15,550,027,687.18/142,653.88
6. Step 6: Final answer
   x = 109,005.29