Finding the Fourth Proportional to 2,128.38, 2,936.37 and 1,570.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.38 : 2,936.37 = 1,570.20 : x
2. Step 2: Convert to fraction form
   2,128.38/2,936.37 = 1,570.20/x
3. Step 3: Cross multiply
   2,128.38x = 2,936.37 × 1,570.20
4. Step 4: Simplify right side
   2,128.38x = 4,610,688.17
5. Step 5: Solve for x
   x = 4,610,688.17/2,128.38
6. Step 6: Final answer
   x = 2,166.29