Finding the Fourth Proportional to 142,369.98, 213,061.14 and 86,175.96

Step by Step Solution

1. Step 1: Write the proportion equation
   142,369.98 : 213,061.14 = 86,175.96 : x
2. Step 2: Convert to fraction form
   142,369.98/213,061.14 = 86,175.96/x
3. Step 3: Cross multiply
   142,369.98x = 213,061.14 × 86,175.96
4. Step 4: Simplify right side
   142,369.98x = 18,360,748,278.19
5. Step 5: Solve for x
   x = 18,360,748,278.19/142,369.98
6. Step 6: Final answer
   x = 128,965.03