Finding the Fourth Proportional to 4,321.56, 6,481.55 and 1,200.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,321.56 : 6,481.55 = 1,200.78 : x
2. Step 2: Convert to fraction form
   4,321.56/6,481.55 = 1,200.78/x
3. Step 3: Cross multiply
   4,321.56x = 6,481.55 × 1,200.78
4. Step 4: Simplify right side
   4,321.56x = 7,782,915.61
5. Step 5: Solve for x
   x = 7,782,915.61/4,321.56
6. Step 6: Final answer
   x = 1,800.95