Finding the Fourth Proportional to 12,139.88, 18,210.83 and 3,374.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.88 : 18,210.83 = 3,374.87 : x
2. Step 2: Convert to fraction form
   12,139.88/18,210.83 = 3,374.87/x
3. Step 3: Cross multiply
   12,139.88x = 18,210.83 × 3,374.87
4. Step 4: Simplify right side
   12,139.88x = 61,459,075.91
5. Step 5: Solve for x
   x = 61,459,075.91/12,139.88
6. Step 6: Final answer
   x = 5,062.58