Finding the Fourth Proportional to 12,139.95, 18,209.96 and 3,374.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.95 : 18,209.96 = 3,374.87 : x
2. Step 2: Convert to fraction form
   12,139.95/18,209.96 = 3,374.87/x
3. Step 3: Cross multiply
   12,139.95x = 18,209.96 × 3,374.87
4. Step 4: Simplify right side
   12,139.95x = 61,456,171.42
5. Step 5: Solve for x
   x = 61,456,171.42/12,139.95
6. Step 6: Final answer
   x = 5,062.31