Finding the Fourth Proportional to 2,290.56, 3,156.16 and 1,553.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.56 : 3,156.16 = 1,553.28 : x
2. Step 2: Convert to fraction form
   2,290.56/3,156.16 = 1,553.28/x
3. Step 3: Cross multiply
   2,290.56x = 3,156.16 × 1,553.28
4. Step 4: Simplify right side
   2,290.56x = 4,902,400.20
5. Step 5: Solve for x
   x = 4,902,400.20/2,290.56
6. Step 6: Final answer
   x = 2,140.26