Finding the Fourth Proportional to 28,461.82, 42,708.24 and 19,109.64

Step by Step Solution

1. Step 1: Write the proportion equation
   28,461.82 : 42,708.24 = 19,109.64 : x
2. Step 2: Convert to fraction form
   28,461.82/42,708.24 = 19,109.64/x
3. Step 3: Cross multiply
   28,461.82x = 42,708.24 × 19,109.64
4. Step 4: Simplify right side
   28,461.82x = 816,139,091.43
5. Step 5: Solve for x
   x = 816,139,091.43/28,461.82
6. Step 6: Final answer
   x = 28,674.87