Finding the Fourth Proportional to 12,819.77, 17,453.96 and 12,780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.77 : 17,453.96 = 12,780.28 : x
2. Step 2: Convert to fraction form
   12,819.77/17,453.96 = 12,780.28/x
3. Step 3: Cross multiply
   12,819.77x = 17,453.96 × 12,780.28
4. Step 4: Simplify right side
   12,819.77x = 223,066,344.74
5. Step 5: Solve for x
   x = 223,066,344.74/12,819.77
6. Step 6: Final answer
   x = 17,400.19