Finding the Fourth Proportional to 13,255.10, 19,877.79 and 3,892.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,255.10 : 19,877.79 = 3,892.72 : x
2. Step 2: Convert to fraction form
   13,255.10/19,877.79 = 3,892.72/x
3. Step 3: Cross multiply
   13,255.10x = 19,877.79 × 3,892.72
4. Step 4: Simplify right side
   13,255.10x = 77,378,670.69
5. Step 5: Solve for x
   x = 77,378,670.69/13,255.10
6. Step 6: Final answer
   x = 5,837.65