Finding the Fourth Proportional to 12,783.42, 19,150.29 and 7,219.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.42 : 19,150.29 = 7,219.53 : x
2. Step 2: Convert to fraction form
   12,783.42/19,150.29 = 7,219.53/x
3. Step 3: Cross multiply
   12,783.42x = 19,150.29 × 7,219.53
4. Step 4: Simplify right side
   12,783.42x = 138,256,093.16
5. Step 5: Solve for x
   x = 138,256,093.16/12,783.42
6. Step 6: Final answer
   x = 10,815.27