Finding the Fourth Proportional to 1,399.55, 2,095.28 and 1,054.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.55 : 2,095.28 = 1,054.34 : x
2. Step 2: Convert to fraction form
   1,399.55/2,095.28 = 1,054.34/x
3. Step 3: Cross multiply
   1,399.55x = 2,095.28 × 1,054.34
4. Step 4: Simplify right side
   1,399.55x = 2,209,132.24
5. Step 5: Solve for x
   x = 2,209,132.24/1,399.55
6. Step 6: Final answer
   x = 1,578.46