Finding the Fourth Proportional to 2,274.32, 3,138.59 and 1,389.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.32 : 3,138.59 = 1,389.93 : x
2. Step 2: Convert to fraction form
   2,274.32/3,138.59 = 1,389.93/x
3. Step 3: Cross multiply
   2,274.32x = 3,138.59 × 1,389.93
4. Step 4: Simplify right side
   2,274.32x = 4,362,413.45
5. Step 5: Solve for x
   x = 4,362,413.45/2,274.32
6. Step 6: Final answer
   x = 1,918.12