Finding the Fourth Proportional to 12,777.32, 19,161 and 3,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,777.32 : 19,161 = 3,890.72 : x
2. Step 2: Convert to fraction form
   12,777.32/19,161 = 3,890.72/x
3. Step 3: Cross multiply
   12,777.32x = 19,161 × 3,890.72
4. Step 4: Simplify right side
   12,777.32x = 74,550,085.92
5. Step 5: Solve for x
   x = 74,550,085.92/12,777.32
6. Step 6: Final answer
   x = 5,834.56