Finding the Fourth Proportional to 12,139.83, 18,209.16 and 3,374.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.83 : 18,209.16 = 3,374.55 : x
2. Step 2: Convert to fraction form
   12,139.83/18,209.16 = 3,374.55/x
3. Step 3: Cross multiply
   12,139.83x = 18,209.16 × 3,374.55
4. Step 4: Simplify right side
   12,139.83x = 61,447,720.88
5. Step 5: Solve for x
   x = 61,447,720.88/12,139.83
6. Step 6: Final answer
   x = 5,061.66