Finding the Fourth Proportional to 8,917.39, 12,300.56 and 5,729.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,917.39 : 12,300.56 = 5,729.64 : x
2. Step 2: Convert to fraction form
   8,917.39/12,300.56 = 5,729.64/x
3. Step 3: Cross multiply
   8,917.39x = 12,300.56 × 5,729.64
4. Step 4: Simplify right side
   8,917.39x = 70,477,727.31
5. Step 5: Solve for x
   x = 70,477,727.31/8,917.39
6. Step 6: Final answer
   x = 7,903.40