Finding the Fourth Proportional to 1,445.21, 1,993.01 and 1,339.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.21 : 1,993.01 = 1,339.10 : x
2. Step 2: Convert to fraction form
   1,445.21/1,993.01 = 1,339.10/x
3. Step 3: Cross multiply
   1,445.21x = 1,993.01 × 1,339.10
4. Step 4: Simplify right side
   1,445.21x = 2,668,830.50
5. Step 5: Solve for x
   x = 2,668,830.50/1,445.21
6. Step 6: Final answer
   x = 1,846.67