Finding the Fourth Proportional to 142,091.71, 196,086.58 and 78,429.53

Step by Step Solution

1. Step 1: Write the proportion equation
   142,091.71 : 196,086.58 = 78,429.53 : x
2. Step 2: Convert to fraction form
   142,091.71/196,086.58 = 78,429.53/x
3. Step 3: Cross multiply
   142,091.71x = 196,086.58 × 78,429.53
4. Step 4: Simplify right side
   142,091.71x = 15,378,977,401.81
5. Step 5: Solve for x
   x = 15,378,977,401.81/142,091.71
6. Step 6: Final answer
   x = 108,232.75