Finding the Fourth Proportional to 10,525.77, 15,786.59 and 4,978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,525.77 : 15,786.59 = 4,978.31 : x
2. Step 2: Convert to fraction form
   10,525.77/15,786.59 = 4,978.31/x
3. Step 3: Cross multiply
   10,525.77x = 15,786.59 × 4,978.31
4. Step 4: Simplify right side
   10,525.77x = 78,590,553.44
5. Step 5: Solve for x
   x = 78,590,553.44/10,525.77
6. Step 6: Final answer
   x = 7,466.49