Finding the Fourth Proportional to 3,187.76, 4,783.86 and 1,213.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,187.76 : 4,783.86 = 1,213.18 : x
2. Step 2: Convert to fraction form
   3,187.76/4,783.86 = 1,213.18/x
3. Step 3: Cross multiply
   3,187.76x = 4,783.86 × 1,213.18
4. Step 4: Simplify right side
   3,187.76x = 5,803,671.32
5. Step 5: Solve for x
   x = 5,803,671.32/3,187.76
6. Step 6: Final answer
   x = 1,820.61