Finding the Fourth Proportional to 1,419.12, 1,956.99 and 921.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.12 : 1,956.99 = 921.57 : x
2. Step 2: Convert to fraction form
   1,419.12/1,956.99 = 921.57/x
3. Step 3: Cross multiply
   1,419.12x = 1,956.99 × 921.57
4. Step 4: Simplify right side
   1,419.12x = 1,803,503.27
5. Step 5: Solve for x
   x = 1,803,503.27/1,419.12
6. Step 6: Final answer
   x = 1,270.86