Finding the Fourth Proportional to 142,386.84, 196,476.66 and 78,715.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142,386.84 : 196,476.66 = 78,715.98 : x
2. Step 2: Convert to fraction form
   142,386.84/196,476.66 = 78,715.98/x
3. Step 3: Cross multiply
   142,386.84x = 196,476.66 × 78,715.98
4. Step 4: Simplify right side
   142,386.84x = 15,465,852,839.03
5. Step 5: Solve for x
   x = 15,465,852,839.03/142,386.84
6. Step 6: Final answer
   x = 108,618.56