Finding the Fourth Proportional to 12,485.94, 18,729 and 3,126.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.94 : 18,729 = 3,126.12 : x
2. Step 2: Convert to fraction form
   12,485.94/18,729 = 3,126.12/x
3. Step 3: Cross multiply
   12,485.94x = 18,729 × 3,126.12
4. Step 4: Simplify right side
   12,485.94x = 58,549,101.48
5. Step 5: Solve for x
   x = 58,549,101.48/12,485.94
6. Step 6: Final answer
   x = 4,689.20