Finding the Fourth Proportional to 1,379.64, 1,901.72 and 1,084.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.64 : 1,901.72 = 1,084.40 : x
2. Step 2: Convert to fraction form
   1,379.64/1,901.72 = 1,084.40/x
3. Step 3: Cross multiply
   1,379.64x = 1,901.72 × 1,084.40
4. Step 4: Simplify right side
   1,379.64x = 2,062,225.17
5. Step 5: Solve for x
   x = 2,062,225.17/1,379.64
6. Step 6: Final answer
   x = 1,494.76