Finding the Fourth Proportional to 1,399.74, 2,101.05 and 1,155.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.74 : 2,101.05 = 1,155.49 : x
2. Step 2: Convert to fraction form
   1,399.74/2,101.05 = 1,155.49/x
3. Step 3: Cross multiply
   1,399.74x = 2,101.05 × 1,155.49
4. Step 4: Simplify right side
   1,399.74x = 2,427,739.67
5. Step 5: Solve for x
   x = 2,427,739.67/1,399.74
6. Step 6: Final answer
   x = 1,734.42