Finding the Fourth Proportional to 142,672.88, 213,854.86 and 92,788.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,672.88 : 213,854.86 = 92,788.78 : x
2. Step 2: Convert to fraction form
   142,672.88/213,854.86 = 92,788.78/x
3. Step 3: Cross multiply
   142,672.88x = 213,854.86 × 92,788.78
4. Step 4: Simplify right side
   142,672.88x = 19,843,331,556.47
5. Step 5: Solve for x
   x = 19,843,331,556.47/142,672.88
6. Step 6: Final answer
   x = 139,082.72