Finding the Fourth Proportional to 142,301.99, 196,376.94 and 78,639.81

Step by Step Solution

1. Step 1: Write the proportion equation
   142,301.99 : 196,376.94 = 78,639.81 : x
2. Step 2: Convert to fraction form
   142,301.99/196,376.94 = 78,639.81/x
3. Step 3: Cross multiply
   142,301.99x = 196,376.94 × 78,639.81
4. Step 4: Simplify right side
   142,301.99x = 15,443,044,513.57
5. Step 5: Solve for x
   x = 15,443,044,513.57/142,301.99
6. Step 6: Final answer
   x = 108,523.04