Finding the Fourth Proportional to 20,499.39, 28,276.16 and 12,932.51

Step by Step Solution

1. Step 1: Write the proportion equation
   20,499.39 : 28,276.16 = 12,932.51 : x
2. Step 2: Convert to fraction form
   20,499.39/28,276.16 = 12,932.51/x
3. Step 3: Cross multiply
   20,499.39x = 28,276.16 × 12,932.51
4. Step 4: Simplify right side
   20,499.39x = 365,681,515.92
5. Step 5: Solve for x
   x = 365,681,515.92/20,499.39
6. Step 6: Final answer
   x = 17,838.65