Finding the Fourth Proportional to 12,457.72, 18,686.72 and 3,692.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,457.72 : 18,686.72 = 3,692.68 : x
2. Step 2: Convert to fraction form
   12,457.72/18,686.72 = 3,692.68/x
3. Step 3: Cross multiply
   12,457.72x = 18,686.72 × 3,692.68
4. Step 4: Simplify right side
   12,457.72x = 69,004,077.21
5. Step 5: Solve for x
   x = 69,004,077.21/12,457.72
6. Step 6: Final answer
   x = 5,539.06