Finding the Fourth Proportional to 213,799.86, 320,647.95 and 89,072.82

Step by Step Solution

1. Step 1: Write the proportion equation
   213,799.86 : 320,647.95 = 89,072.82 : x
2. Step 2: Convert to fraction form
   213,799.86/320,647.95 = 89,072.82/x
3. Step 3: Cross multiply
   213,799.86x = 320,647.95 × 89,072.82
4. Step 4: Simplify right side
   213,799.86x = 28,561,017,133.72
5. Step 5: Solve for x
   x = 28,561,017,133.72/213,799.86
6. Step 6: Final answer
   x = 133,587.63