Finding the Fourth Proportional to 12,385.64, 18,576.54 and 3,618.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,385.64 : 18,576.54 = 3,618.76 : x
2. Step 2: Convert to fraction form
   12,385.64/18,576.54 = 3,618.76/x
3. Step 3: Cross multiply
   12,385.64x = 18,576.54 × 3,618.76
4. Step 4: Simplify right side
   12,385.64x = 67,224,039.89
5. Step 5: Solve for x
   x = 67,224,039.89/12,385.64
6. Step 6: Final answer
   x = 5,427.58