Finding the Fourth Proportional to 12,783.96, 19,150.29 and 10,155.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.96 : 19,150.29 = 10,155.78 : x
2. Step 2: Convert to fraction form
   12,783.96/19,150.29 = 10,155.78/x
3. Step 3: Cross multiply
   12,783.96x = 19,150.29 × 10,155.78
4. Step 4: Simplify right side
   12,783.96x = 194,486,132.18
5. Step 5: Solve for x
   x = 194,486,132.18/12,783.96
6. Step 6: Final answer
   x = 15,213.29