Finding the Fourth Proportional to 1,388.34, 2,084.76 and 920.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.34 : 2,084.76 = 920.54 : x
2. Step 2: Convert to fraction form
   1,388.34/2,084.76 = 920.54/x
3. Step 3: Cross multiply
   1,388.34x = 2,084.76 × 920.54
4. Step 4: Simplify right side
   1,388.34x = 1,919,094.55
5. Step 5: Solve for x
   x = 1,919,094.55/1,388.34
6. Step 6: Final answer
   x = 1,382.29