Finding the Fourth Proportional to 22,577.20, 31,156.31 and 13,013.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,577.20 : 31,156.31 = 13,013.60 : x
2. Step 2: Convert to fraction form
   22,577.20/31,156.31 = 13,013.60/x
3. Step 3: Cross multiply
   22,577.20x = 31,156.31 × 13,013.60
4. Step 4: Simplify right side
   22,577.20x = 405,455,632.57
5. Step 5: Solve for x
   x = 405,455,632.57/22,577.20
6. Step 6: Final answer
   x = 17,958.63