Finding the Fourth Proportional to 1,426.39, 1,973.80 and 1,216.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.39 : 1,973.80 = 1,216.23 : x
2. Step 2: Convert to fraction form
   1,426.39/1,973.80 = 1,216.23/x
3. Step 3: Cross multiply
   1,426.39x = 1,973.80 × 1,216.23
4. Step 4: Simplify right side
   1,426.39x = 2,400,588.89
5. Step 5: Solve for x
   x = 2,400,588.89/1,426.39
6. Step 6: Final answer
   x = 1,682.99