Finding the Fourth Proportional to 8,991.18, 12,405.72 and 5,454.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,991.18 : 12,405.72 = 5,454.30 : x
2. Step 2: Convert to fraction form
   8,991.18/12,405.72 = 5,454.30/x
3. Step 3: Cross multiply
   8,991.18x = 12,405.72 × 5,454.30
4. Step 4: Simplify right side
   8,991.18x = 67,664,518.60
5. Step 5: Solve for x
   x = 67,664,518.60/8,991.18
6. Step 6: Final answer
   x = 7,525.65