Finding the Fourth Proportional to 5,051.78, 7,575.24 and 2,128.49

Step by Step Solution

1. Step 1: Write the proportion equation
   5,051.78 : 7,575.24 = 2,128.49 : x
2. Step 2: Convert to fraction form
   5,051.78/7,575.24 = 2,128.49/x
3. Step 3: Cross multiply
   5,051.78x = 7,575.24 × 2,128.49
4. Step 4: Simplify right side
   5,051.78x = 16,123,822.59
5. Step 5: Solve for x
   x = 16,123,822.59/5,051.78
6. Step 6: Final answer
   x = 3,191.71