Finding the Fourth Proportional to 142,986.84, 197,325.90 and 78,459

Step by Step Solution

1. Step 1: Write the proportion equation
   142,986.84 : 197,325.90 = 78,459 : x
2. Step 2: Convert to fraction form
   142,986.84/197,325.90 = 78,459/x
3. Step 3: Cross multiply
   142,986.84x = 197,325.90 × 78,459
4. Step 4: Simplify right side
   142,986.84x = 15,481,992,788.10
5. Step 5: Solve for x
   x = 15,481,992,788.10/142,986.84
6. Step 6: Final answer
   x = 108,275.65