Finding the Fourth Proportional to 12,780.14, 19,144.69 and 10,152.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.14 : 19,144.69 = 10,152.10 : x
2. Step 2: Convert to fraction form
   12,780.14/19,144.69 = 10,152.10/x
3. Step 3: Cross multiply
   12,780.14x = 19,144.69 × 10,152.10
4. Step 4: Simplify right side
   12,780.14x = 194,358,734.11
5. Step 5: Solve for x
   x = 194,358,734.11/12,780.14
6. Step 6: Final answer
   x = 15,207.87