Finding the Fourth Proportional to 1,084.39, 1,624.15 and 840.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.39 : 1,624.15 = 840.17 : x
2. Step 2: Convert to fraction form
   1,084.39/1,624.15 = 840.17/x
3. Step 3: Cross multiply
   1,084.39x = 1,624.15 × 840.17
4. Step 4: Simplify right side
   1,084.39x = 1,364,567.22
5. Step 5: Solve for x
   x = 1,364,567.22/1,084.39
6. Step 6: Final answer
   x = 1,258.38