Finding the Fourth Proportional to 30,554.78, 42,086.73 and 21,586.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,554.78 : 42,086.73 = 21,586.72 : x
2. Step 2: Convert to fraction form
   30,554.78/42,086.73 = 21,586.72/x
3. Step 3: Cross multiply
   30,554.78x = 42,086.73 × 21,586.72
4. Step 4: Simplify right side
   30,554.78x = 908,514,351.01
5. Step 5: Solve for x
   x = 908,514,351.01/30,554.78
6. Step 6: Final answer
   x = 29,733.95