Finding the Fourth Proportional to 12,139.59, 18,212.13 and 3,706.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.59 : 18,212.13 = 3,706.86 : x
2. Step 2: Convert to fraction form
   12,139.59/18,212.13 = 3,706.86/x
3. Step 3: Cross multiply
   12,139.59x = 18,212.13 × 3,706.86
4. Step 4: Simplify right side
   12,139.59x = 67,509,816.21
5. Step 5: Solve for x
   x = 67,509,816.21/12,139.59
6. Step 6: Final answer
   x = 5,561.13