Finding the Fourth Proportional to 1,605.61, 2,216.72 and 1,047.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.61 : 2,216.72 = 1,047.05 : x
2. Step 2: Convert to fraction form
   1,605.61/2,216.72 = 1,047.05/x
3. Step 3: Cross multiply
   1,605.61x = 2,216.72 × 1,047.05
4. Step 4: Simplify right side
   1,605.61x = 2,321,019.21
5. Step 5: Solve for x
   x = 2,321,019.21/1,605.61
6. Step 6: Final answer
   x = 1,445.57