Finding the Fourth Proportional to 2,103.30, 3,157.35 and 1,238.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.30 : 3,157.35 = 1,238.10 : x
2. Step 2: Convert to fraction form
   2,103.30/3,157.35 = 1,238.10/x
3. Step 3: Cross multiply
   2,103.30x = 3,157.35 × 1,238.10
4. Step 4: Simplify right side
   2,103.30x = 3,909,115.04
5. Step 5: Solve for x
   x = 3,909,115.04/2,103.30
6. Step 6: Final answer
   x = 1,858.56