Finding the Fourth Proportional to 13,277.78, 19,796.27 and 12,931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,277.78 : 19,796.27 = 12,931.50 : x
2. Step 2: Convert to fraction form
   13,277.78/19,796.27 = 12,931.50/x
3. Step 3: Cross multiply
   13,277.78x = 19,796.27 × 12,931.50
4. Step 4: Simplify right side
   13,277.78x = 255,995,465.51
5. Step 5: Solve for x
   x = 255,995,465.51/13,277.78
6. Step 6: Final answer
   x = 19,280.00