Finding the Fourth Proportional to 13,155.78, 19,720.82 and 5,255.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.78 : 19,720.82 = 5,255.94 : x
2. Step 2: Convert to fraction form
   13,155.78/19,720.82 = 5,255.94/x
3. Step 3: Cross multiply
   13,155.78x = 19,720.82 × 5,255.94
4. Step 4: Simplify right side
   13,155.78x = 103,651,446.67
5. Step 5: Solve for x
   x = 103,651,446.67/13,155.78
6. Step 6: Final answer
   x = 7,878.78