Finding the Fourth Proportional to 12,738.45, 19,085 and 10,870.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.45 : 19,085 = 10,870.59 : x
2. Step 2: Convert to fraction form
   12,738.45/19,085 = 10,870.59/x
3. Step 3: Cross multiply
   12,738.45x = 19,085 × 10,870.59
4. Step 4: Simplify right side
   12,738.45x = 207,465,210.15
5. Step 5: Solve for x
   x = 207,465,210.15/12,738.45
6. Step 6: Final answer
   x = 16,286.53