Finding the Fourth Proportional to 30,556.79, 42,089.49 and 21,588.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,556.79 : 42,089.49 = 21,588.72 : x
2. Step 2: Convert to fraction form
   30,556.79/42,089.49 = 21,588.72/x
3. Step 3: Cross multiply
   30,556.79x = 42,089.49 × 21,588.72
4. Step 4: Simplify right side
   30,556.79x = 908,658,214.55
5. Step 5: Solve for x
   x = 908,658,214.55/30,556.79
6. Step 6: Final answer
   x = 29,736.70