Finding the Fourth Proportional to 142,417.89, 196,556.27 and 81,987.21

Step by Step Solution

1. Step 1: Write the proportion equation
   142,417.89 : 196,556.27 = 81,987.21 : x
2. Step 2: Convert to fraction form
   142,417.89/196,556.27 = 81,987.21/x
3. Step 3: Cross multiply
   142,417.89x = 196,556.27 × 81,987.21
4. Step 4: Simplify right side
   142,417.89x = 16,115,099,775.37
5. Step 5: Solve for x
   x = 16,115,099,775.37/142,417.89
6. Step 6: Final answer
   x = 113,153.62