Finding the Fourth Proportional to 8,990.52, 12,408.54 and 5,636.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.52 : 12,408.54 = 5,636.22 : x
2. Step 2: Convert to fraction form
   8,990.52/12,408.54 = 5,636.22/x
3. Step 3: Cross multiply
   8,990.52x = 12,408.54 × 5,636.22
4. Step 4: Simplify right side
   8,990.52x = 69,937,261.32
5. Step 5: Solve for x
   x = 69,937,261.32/8,990.52
6. Step 6: Final answer
   x = 7,779.00