Finding the Fourth Proportional to 1,103.81, 1,663.29 and 913.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.81 : 1,663.29 = 913.10 : x
2. Step 2: Convert to fraction form
   1,103.81/1,663.29 = 913.10/x
3. Step 3: Cross multiply
   1,103.81x = 1,663.29 × 913.10
4. Step 4: Simplify right side
   1,103.81x = 1,518,741.78
5. Step 5: Solve for x
   x = 1,518,741.78/1,103.81
6. Step 6: Final answer
   x = 1,375.91