Finding the Fourth Proportional to 1,421.52, 2,131.38 and 933.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.52 : 2,131.38 = 933.72 : x
2. Step 2: Convert to fraction form
   1,421.52/2,131.38 = 933.72/x
3. Step 3: Cross multiply
   1,421.52x = 2,131.38 × 933.72
4. Step 4: Simplify right side
   1,421.52x = 1,990,112.13
5. Step 5: Solve for x
   x = 1,990,112.13/1,421.52
6. Step 6: Final answer
   x = 1,399.99