Finding the Fourth Proportional to 143,155.89, 214,306.16 and 86,825.25

Step by Step Solution

1. Step 1: Write the proportion equation
   143,155.89 : 214,306.16 = 86,825.25 : x
2. Step 2: Convert to fraction form
   143,155.89/214,306.16 = 86,825.25/x
3. Step 3: Cross multiply
   143,155.89x = 214,306.16 × 86,825.25
4. Step 4: Simplify right side
   143,155.89x = 18,607,185,484.41
5. Step 5: Solve for x
   x = 18,607,185,484.41/143,155.89
6. Step 6: Final answer
   x = 129,978.48