Finding the Fourth Proportional to 1,914.50, 2,874.38 and 990.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.50 : 2,874.38 = 990.70 : x
2. Step 2: Convert to fraction form
   1,914.50/2,874.38 = 990.70/x
3. Step 3: Cross multiply
   1,914.50x = 2,874.38 × 990.70
4. Step 4: Simplify right side
   1,914.50x = 2,847,648.27
5. Step 5: Solve for x
   x = 2,847,648.27/1,914.50
6. Step 6: Final answer
   x = 1,487.41