Finding the Fourth Proportional to 1,003.96, 1,384.76 and 921.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.96 : 1,384.76 = 921.34 : x
2. Step 2: Convert to fraction form
   1,003.96/1,384.76 = 921.34/x
3. Step 3: Cross multiply
   1,003.96x = 1,384.76 × 921.34
4. Step 4: Simplify right side
   1,003.96x = 1,275,830.16
5. Step 5: Solve for x
   x = 1,275,830.16/1,003.96
6. Step 6: Final answer
   x = 1,270.80