Finding the Fourth Proportional to 1,333.56, 2,002.18 and 921.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.56 : 2,002.18 = 921.68 : x
2. Step 2: Convert to fraction form
   1,333.56/2,002.18 = 921.68/x
3. Step 3: Cross multiply
   1,333.56x = 2,002.18 × 921.68
4. Step 4: Simplify right side
   1,333.56x = 1,845,369.26
5. Step 5: Solve for x
   x = 1,845,369.26/1,333.56
6. Step 6: Final answer
   x = 1,383.79