Finding the Fourth Proportional to 1,389.72, 2,074.83 and 1,146.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.72 : 2,074.83 = 1,146.72 : x
2. Step 2: Convert to fraction form
   1,389.72/2,074.83 = 1,146.72/x
3. Step 3: Cross multiply
   1,389.72x = 2,074.83 × 1,146.72
4. Step 4: Simplify right side
   1,389.72x = 2,379,249.06
5. Step 5: Solve for x
   x = 2,379,249.06/1,389.72
6. Step 6: Final answer
   x = 1,712.03