Finding the Fourth Proportional to 3,525.98, 4,865.78 and 2,128.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,525.98 : 4,865.78 = 2,128.74 : x
2. Step 2: Convert to fraction form
   3,525.98/4,865.78 = 2,128.74/x
3. Step 3: Cross multiply
   3,525.98x = 4,865.78 × 2,128.74
4. Step 4: Simplify right side
   3,525.98x = 10,357,980.52
5. Step 5: Solve for x
   x = 10,357,980.52/3,525.98
6. Step 6: Final answer
   x = 2,937.62