Finding the Fourth Proportional to 2,128.90, 3,193.89 and 974.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.90 : 3,193.89 = 974.38 : x
2. Step 2: Convert to fraction form
   2,128.90/3,193.89 = 974.38/x
3. Step 3: Cross multiply
   2,128.90x = 3,193.89 × 974.38
4. Step 4: Simplify right side
   2,128.90x = 3,112,062.54
5. Step 5: Solve for x
   x = 3,112,062.54/2,128.90
6. Step 6: Final answer
   x = 1,461.82