Finding the Fourth Proportional to 1,357.11, 1,870.54 and 1,306.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.11 : 1,870.54 = 1,306.08 : x
2. Step 2: Convert to fraction form
   1,357.11/1,870.54 = 1,306.08/x
3. Step 3: Cross multiply
   1,357.11x = 1,870.54 × 1,306.08
4. Step 4: Simplify right side
   1,357.11x = 2,443,074.88
5. Step 5: Solve for x
   x = 2,443,074.88/1,357.11
6. Step 6: Final answer
   x = 1,800.20