Finding the Fourth Proportional to 12,900.42, 19,350.54 and 3,666.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.42 : 19,350.54 = 3,666.42 : x
2. Step 2: Convert to fraction form
   12,900.42/19,350.54 = 3,666.42/x
3. Step 3: Cross multiply
   12,900.42x = 19,350.54 × 3,666.42
4. Step 4: Simplify right side
   12,900.42x = 70,947,206.87
5. Step 5: Solve for x
   x = 70,947,206.87/12,900.42
6. Step 6: Final answer
   x = 5,499.60