Finding the Fourth Proportional to 20,317.05, 28,054.83 and 12,776.00

Step by Step Solution

1. Step 1: Write the proportion equation
   20,317.05 : 28,054.83 = 12,776.00 : x
2. Step 2: Convert to fraction form
   20,317.05/28,054.83 = 12,776.00/x
3. Step 3: Cross multiply
   20,317.05x = 28,054.83 × 12,776.00
4. Step 4: Simplify right side
   20,317.05x = 358,428,367.81
5. Step 5: Solve for x
   x = 358,428,367.81/20,317.05
6. Step 6: Final answer
   x = 17,641.75