Finding the Fourth Proportional to 143,389.18, 197,926.28 and 86,800.56

Step by Step Solution

1. Step 1: Write the proportion equation
   143,389.18 : 197,926.28 = 86,800.56 : x
2. Step 2: Convert to fraction form
   143,389.18/197,926.28 = 86,800.56/x
3. Step 3: Cross multiply
   143,389.18x = 197,926.28 × 86,800.56
4. Step 4: Simplify right side
   143,389.18x = 17,180,111,942.72
5. Step 5: Solve for x
   x = 17,180,111,942.72/143,389.18
6. Step 6: Final answer
   x = 119,814.56