Finding the Fourth Proportional to 1,003.56, 1,381.89 and 945.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.56 : 1,381.89 = 945.11 : x
2. Step 2: Convert to fraction form
   1,003.56/1,381.89 = 945.11/x
3. Step 3: Cross multiply
   1,003.56x = 1,381.89 × 945.11
4. Step 4: Simplify right side
   1,003.56x = 1,306,031.15
5. Step 5: Solve for x
   x = 1,306,031.15/1,003.56
6. Step 6: Final answer
   x = 1,301.40