Finding the Fourth Proportional to 30,513.48, 42,109.26 and 21,576.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,513.48 : 42,109.26 = 21,576.72 : x
2. Step 2: Convert to fraction form
   30,513.48/42,109.26 = 21,576.72/x
3. Step 3: Cross multiply
   30,513.48x = 42,109.26 × 21,576.72
4. Step 4: Simplify right side
   30,513.48x = 908,579,712.43
5. Step 5: Solve for x
   x = 908,579,712.43/30,513.48
6. Step 6: Final answer
   x = 29,776.34