Finding the Fourth Proportional to 1,914.48, 2,874.38 and 990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.48 : 2,874.38 = 990.72 : x
2. Step 2: Convert to fraction form
   1,914.48/2,874.38 = 990.72/x
3. Step 3: Cross multiply
   1,914.48x = 2,874.38 × 990.72
4. Step 4: Simplify right side
   1,914.48x = 2,847,705.75
5. Step 5: Solve for x
   x = 2,847,705.75/1,914.48
6. Step 6: Final answer
   x = 1,487.46