Finding the Fourth Proportional to 13,620.77, 18,796.22 and 7,570.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,620.77 : 18,796.22 = 7,570.98 : x
2. Step 2: Convert to fraction form
   13,620.77/18,796.22 = 7,570.98/x
3. Step 3: Cross multiply
   13,620.77x = 18,796.22 × 7,570.98
4. Step 4: Simplify right side
   13,620.77x = 142,305,796.23
5. Step 5: Solve for x
   x = 142,305,796.23/13,620.77
6. Step 6: Final answer
   x = 10,447.71