Finding the Fourth Proportional to 8,990.45, 13,488.31 and 2,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.45 : 13,488.31 = 2,665.50 : x
2. Step 2: Convert to fraction form
   8,990.45/13,488.31 = 2,665.50/x
3. Step 3: Cross multiply
   8,990.45x = 13,488.31 × 2,665.50
4. Step 4: Simplify right side
   8,990.45x = 35,953,090.31
5. Step 5: Solve for x
   x = 35,953,090.31/8,990.45
6. Step 6: Final answer
   x = 3,999.03