Finding the Fourth Proportional to 142,585.48, 213,757.92 and 89,878.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,585.48 : 213,757.92 = 89,878.76 : x
2. Step 2: Convert to fraction form
   142,585.48/213,757.92 = 89,878.76/x
3. Step 3: Cross multiply
   142,585.48x = 213,757.92 × 89,878.76
4. Step 4: Simplify right side
   142,585.48x = 19,212,296,789.78
5. Step 5: Solve for x
   x = 19,212,296,789.78/142,585.48
6. Step 6: Final answer
   x = 134,742.31