Finding the Fourth Proportional to 2,571.51, 3,856.32 and 990.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.51 : 3,856.32 = 990.03 : x
2. Step 2: Convert to fraction form
   2,571.51/3,856.32 = 990.03/x
3. Step 3: Cross multiply
   2,571.51x = 3,856.32 × 990.03
4. Step 4: Simplify right side
   2,571.51x = 3,817,872.49
5. Step 5: Solve for x
   x = 3,817,872.49/2,571.51
6. Step 6: Final answer
   x = 1,484.68