Finding the Fourth Proportional to 3,621.34, 5,430.86 and 1,866.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,621.34 : 5,430.86 = 1,866.12 : x
2. Step 2: Convert to fraction form
   3,621.34/5,430.86 = 1,866.12/x
3. Step 3: Cross multiply
   3,621.34x = 5,430.86 × 1,866.12
4. Step 4: Simplify right side
   3,621.34x = 10,134,608.52
5. Step 5: Solve for x
   x = 10,134,608.52/3,621.34
6. Step 6: Final answer
   x = 2,798.58