Finding the Fourth Proportional to 3,553.47, 4,902.78 and 2,117.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,553.47 : 4,902.78 = 2,117.61 : x
2. Step 2: Convert to fraction form
   3,553.47/4,902.78 = 2,117.61/x
3. Step 3: Cross multiply
   3,553.47x = 4,902.78 × 2,117.61
4. Step 4: Simplify right side
   3,553.47x = 10,382,175.96
5. Step 5: Solve for x
   x = 10,382,175.96/3,553.47
6. Step 6: Final answer
   x = 2,921.70