Finding the Fourth Proportional to 12,856.41, 19,282.46 and 3,620.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.41 : 19,282.46 = 3,620.25 : x
2. Step 2: Convert to fraction form
   12,856.41/19,282.46 = 3,620.25/x
3. Step 3: Cross multiply
   12,856.41x = 19,282.46 × 3,620.25
4. Step 4: Simplify right side
   12,856.41x = 69,807,307.71
5. Step 5: Solve for x
   x = 69,807,307.71/12,856.41
6. Step 6: Final answer
   x = 5,429.77