Finding the Fourth Proportional to 1,522.60, 2,280.30 and 939.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.60 : 2,280.30 = 939.40 : x
2. Step 2: Convert to fraction form
   1,522.60/2,280.30 = 939.40/x
3. Step 3: Cross multiply
   1,522.60x = 2,280.30 × 939.40
4. Step 4: Simplify right side
   1,522.60x = 2,142,113.82
5. Step 5: Solve for x
   x = 2,142,113.82/1,522.60
6. Step 6: Final answer
   x = 1,406.88