Finding the Fourth Proportional to 2,128.95, 3,189.27 and 1,396.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.95 : 3,189.27 = 1,396.29 : x
2. Step 2: Convert to fraction form
   2,128.95/3,189.27 = 1,396.29/x
3. Step 3: Cross multiply
   2,128.95x = 3,189.27 × 1,396.29
4. Step 4: Simplify right side
   2,128.95x = 4,453,145.81
5. Step 5: Solve for x
   x = 4,453,145.81/2,128.95
6. Step 6: Final answer
   x = 2,091.71