Finding the Fourth Proportional to 12,900.56, 19,354.10 and 3,666.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.56 : 19,354.10 = 3,666.56 : x
2. Step 2: Convert to fraction form
   12,900.56/19,354.10 = 3,666.56/x
3. Step 3: Cross multiply
   12,900.56x = 19,354.10 × 3,666.56
4. Step 4: Simplify right side
   12,900.56x = 70,962,998.95
5. Step 5: Solve for x
   x = 70,962,998.95/12,900.56
6. Step 6: Final answer
   x = 5,500.77