Finding the Fourth Proportional to 1,421.38, 2,131.50 and 837.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.38 : 2,131.50 = 837.57 : x
2. Step 2: Convert to fraction form
   1,421.38/2,131.50 = 837.57/x
3. Step 3: Cross multiply
   1,421.38x = 2,131.50 × 837.57
4. Step 4: Simplify right side
   1,421.38x = 1,785,280.46
5. Step 5: Solve for x
   x = 1,785,280.46/1,421.38
6. Step 6: Final answer
   x = 1,256.02