Finding the Fourth Proportional to 13,253.10, 19,874.79 and 3,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,253.10 : 19,874.79 = 3,890.72 : x
2. Step 2: Convert to fraction form
   13,253.10/19,874.79 = 3,890.72/x
3. Step 3: Cross multiply
   13,253.10x = 19,874.79 × 3,890.72
4. Step 4: Simplify right side
   13,253.10x = 77,327,242.95
5. Step 5: Solve for x
   x = 77,327,242.95/13,253.10
6. Step 6: Final answer
   x = 5,834.65