Finding the Fourth Proportional to 3,428.72, 5,142.32 and 963.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,428.72 : 5,142.32 = 963.78 : x
2. Step 2: Convert to fraction form
   3,428.72/5,142.32 = 963.78/x
3. Step 3: Cross multiply
   3,428.72x = 5,142.32 × 963.78
4. Step 4: Simplify right side
   3,428.72x = 4,956,060.35
5. Step 5: Solve for x
   x = 4,956,060.35/3,428.72
6. Step 6: Final answer
   x = 1,445.46