Finding the Fourth Proportional to 10,028.78, 13,840.74 and 5,779.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,028.78 : 13,840.74 = 5,779.99 : x
2. Step 2: Convert to fraction form
   10,028.78/13,840.74 = 5,779.99/x
3. Step 3: Cross multiply
   10,028.78x = 13,840.74 × 5,779.99
4. Step 4: Simplify right side
   10,028.78x = 79,999,309.89
5. Step 5: Solve for x
   x = 79,999,309.89/10,028.78
6. Step 6: Final answer
   x = 7,976.97