Finding the Fourth Proportional to 12,259.95, 18,391.59 and 3,937.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,259.95 : 18,391.59 = 3,937.20 : x
2. Step 2: Convert to fraction form
   12,259.95/18,391.59 = 3,937.20/x
3. Step 3: Cross multiply
   12,259.95x = 18,391.59 × 3,937.20
4. Step 4: Simplify right side
   12,259.95x = 72,411,368.15
5. Step 5: Solve for x
   x = 72,411,368.15/12,259.95
6. Step 6: Final answer
   x = 5,906.33