Finding the Fourth Proportional to 8,790.39, 12,132.72 and 5,436.45

Step by Step Solution

1. Step 1: Write the proportion equation
   8,790.39 : 12,132.72 = 5,436.45 : x
2. Step 2: Convert to fraction form
   8,790.39/12,132.72 = 5,436.45/x
3. Step 3: Cross multiply
   8,790.39x = 12,132.72 × 5,436.45
4. Step 4: Simplify right side
   8,790.39x = 65,958,925.64
5. Step 5: Solve for x
   x = 65,958,925.64/8,790.39
6. Step 6: Final answer
   x = 7,503.53