Finding the Fourth Proportional to 28,007.04, 42,004.68 and 12,414.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,007.04 : 42,004.68 = 12,414.72 : x
2. Step 2: Convert to fraction form
   28,007.04/42,004.68 = 12,414.72/x
3. Step 3: Cross multiply
   28,007.04x = 42,004.68 × 12,414.72
4. Step 4: Simplify right side
   28,007.04x = 521,476,340.89
5. Step 5: Solve for x
   x = 521,476,340.89/28,007.04
6. Step 6: Final answer
   x = 18,619.47