Finding the Fourth Proportional to 3,886.13, 5,823.96 and 2,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.13 : 5,823.96 = 2,128.50 : x
2. Step 2: Convert to fraction form
   3,886.13/5,823.96 = 2,128.50/x
3. Step 3: Cross multiply
   3,886.13x = 5,823.96 × 2,128.50
4. Step 4: Simplify right side
   3,886.13x = 12,396,298.86
5. Step 5: Solve for x
   x = 12,396,298.86/3,886.13
6. Step 6: Final answer
   x = 3,189.89