Finding the Fourth Proportional to 143,841.18, 198,515.52 and 86,499.12

Step by Step Solution

1. Step 1: Write the proportion equation
   143,841.18 : 198,515.52 = 86,499.12 : x
2. Step 2: Convert to fraction form
   143,841.18/198,515.52 = 86,499.12/x
3. Step 3: Cross multiply
   143,841.18x = 198,515.52 × 86,499.12
4. Step 4: Simplify right side
   143,841.18x = 17,171,417,786.34
5. Step 5: Solve for x
   x = 17,171,417,786.34/143,841.18
6. Step 6: Final answer
   x = 119,377.62