Finding the Fourth Proportional to 2,947.30, 4,389.72 and 2,845.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,947.30 : 4,389.72 = 2,845.06 : x
2. Step 2: Convert to fraction form
   2,947.30/4,389.72 = 2,845.06/x
3. Step 3: Cross multiply
   2,947.30x = 4,389.72 × 2,845.06
4. Step 4: Simplify right side
   2,947.30x = 12,489,016.78
5. Step 5: Solve for x
   x = 12,489,016.78/2,947.30
6. Step 6: Final answer
   x = 4,237.44