Finding the Fourth Proportional to 3,897.24, 5,377.98 and 2,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,897.24 : 5,377.98 = 2,128.50 : x
2. Step 2: Convert to fraction form
   3,897.24/5,377.98 = 2,128.50/x
3. Step 3: Cross multiply
   3,897.24x = 5,377.98 × 2,128.50
4. Step 4: Simplify right side
   3,897.24x = 11,447,030.43
5. Step 5: Solve for x
   x = 11,447,030.43/3,897.24
6. Step 6: Final answer
   x = 2,937.21