Finding the Fourth Proportional to 142,021.89, 212,870.97 and 88,738.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,021.89 : 212,870.97 = 88,738.47 : x
2. Step 2: Convert to fraction form
   142,021.89/212,870.97 = 88,738.47/x
3. Step 3: Cross multiply
   142,021.89x = 212,870.97 × 88,738.47
4. Step 4: Simplify right side
   142,021.89x = 18,889,844,185.22
5. Step 5: Solve for x
   x = 18,889,844,185.22/142,021.89
6. Step 6: Final answer
   x = 133,006.57