Finding the Fourth Proportional to 1,426.37, 2,140.76 and 840.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.37 : 2,140.76 = 840.51 : x
2. Step 2: Convert to fraction form
   1,426.37/2,140.76 = 840.51/x
3. Step 3: Cross multiply
   1,426.37x = 2,140.76 × 840.51
4. Step 4: Simplify right side
   1,426.37x = 1,799,332.29
5. Step 5: Solve for x
   x = 1,799,332.29/1,426.37
6. Step 6: Final answer
   x = 1,261.48