Finding the Fourth Proportional to 12,780.98, 19,145.52 and 6,451.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.98 : 19,145.52 = 6,451.96 : x
2. Step 2: Convert to fraction form
   12,780.98/19,145.52 = 6,451.96/x
3. Step 3: Cross multiply
   12,780.98x = 19,145.52 × 6,451.96
4. Step 4: Simplify right side
   12,780.98x = 123,526,074.90
5. Step 5: Solve for x
   x = 123,526,074.90/12,780.98
6. Step 6: Final answer
   x = 9,664.83