Finding the Fourth Proportional to 142,653.96, 196,862.43 and 78,991.74

Step by Step Solution

1. Step 1: Write the proportion equation
   142,653.96 : 196,862.43 = 78,991.74 : x
2. Step 2: Convert to fraction form
   142,653.96/196,862.43 = 78,991.74/x
3. Step 3: Cross multiply
   142,653.96x = 196,862.43 × 78,991.74
4. Step 4: Simplify right side
   142,653.96x = 15,550,505,886.33
5. Step 5: Solve for x
   x = 15,550,505,886.33/142,653.96
6. Step 6: Final answer
   x = 109,008.58