Finding the Fourth Proportional to 1,409.42, 1,943.88 and 1,315.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.42 : 1,943.88 = 1,315.10 : x
2. Step 2: Convert to fraction form
   1,409.42/1,943.88 = 1,315.10/x
3. Step 3: Cross multiply
   1,409.42x = 1,943.88 × 1,315.10
4. Step 4: Simplify right side
   1,409.42x = 2,556,396.59
5. Step 5: Solve for x
   x = 2,556,396.59/1,409.42
6. Step 6: Final answer
   x = 1,813.79