Finding the Fourth Proportional to 1,421.83, 2,133.12 and 1,266.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.83 : 2,133.12 = 1,266.72 : x
2. Step 2: Convert to fraction form
   1,421.83/2,133.12 = 1,266.72/x
3. Step 3: Cross multiply
   1,421.83x = 2,133.12 × 1,266.72
4. Step 4: Simplify right side
   1,421.83x = 2,702,064.14
5. Step 5: Solve for x
   x = 2,702,064.14/1,421.83
6. Step 6: Final answer
   x = 1,900.41