Finding the Fourth Proportional to 3,621.23, 5,430.69 and 1,866.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,621.23 : 5,430.69 = 1,866.00 : x
2. Step 2: Convert to fraction form
   3,621.23/5,430.69 = 1,866.00/x
3. Step 3: Cross multiply
   3,621.23x = 5,430.69 × 1,866.00
4. Step 4: Simplify right side
   3,621.23x = 10,133,687.91
5. Step 5: Solve for x
   x = 10,133,687.91/3,621.23
6. Step 6: Final answer
   x = 2,798.41