Finding the Fourth Proportional to 28,466.16, 42,708.96 and 12,894.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,466.16 : 42,708.96 = 12,894.72 : x
2. Step 2: Convert to fraction form
   28,466.16/42,708.96 = 12,894.72/x
3. Step 3: Cross multiply
   28,466.16x = 42,708.96 × 12,894.72
4. Step 4: Simplify right side
   28,466.16x = 550,720,080.69
5. Step 5: Solve for x
   x = 550,720,080.69/28,466.16
6. Step 6: Final answer
   x = 19,346.48