Finding the Fourth Proportional to 145,259.34, 218,297.25 and 86,103.42

Step by Step Solution

1. Step 1: Write the proportion equation
   145,259.34 : 218,297.25 = 86,103.42 : x
2. Step 2: Convert to fraction form
   145,259.34/218,297.25 = 86,103.42/x
3. Step 3: Cross multiply
   145,259.34x = 218,297.25 × 86,103.42
4. Step 4: Simplify right side
   145,259.34x = 18,796,139,801.60
5. Step 5: Solve for x
   x = 18,796,139,801.60/145,259.34
6. Step 6: Final answer
   x = 129,397.12