Finding the Fourth Proportional to 12,280.59, 18,415.49 and 3,513.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,280.59 : 18,415.49 = 3,513.51 : x
2. Step 2: Convert to fraction form
   12,280.59/18,415.49 = 3,513.51/x
3. Step 3: Cross multiply
   12,280.59x = 18,415.49 × 3,513.51
4. Step 4: Simplify right side
   12,280.59x = 64,702,990.70
5. Step 5: Solve for x
   x = 64,702,990.70/12,280.59
6. Step 6: Final answer
   x = 5,268.72