Finding the Fourth Proportional to 3,676.55, 5,513.64 and 1,210.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,676.55 : 5,513.64 = 1,210.78 : x
2. Step 2: Convert to fraction form
   3,676.55/5,513.64 = 1,210.78/x
3. Step 3: Cross multiply
   3,676.55x = 5,513.64 × 1,210.78
4. Step 4: Simplify right side
   3,676.55x = 6,675,818.82
5. Step 5: Solve for x
   x = 6,675,818.82/3,676.55
6. Step 6: Final answer
   x = 1,815.78