Finding the Fourth Proportional to 3,990.89, 5,506.81 and 2,312.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.89 : 5,506.81 = 2,312.46 : x
2. Step 2: Convert to fraction form
   3,990.89/5,506.81 = 2,312.46/x
3. Step 3: Cross multiply
   3,990.89x = 5,506.81 × 2,312.46
4. Step 4: Simplify right side
   3,990.89x = 12,734,272.07
5. Step 5: Solve for x
   x = 12,734,272.07/3,990.89
6. Step 6: Final answer
   x = 3,190.83