Finding the Fourth Proportional to 31,519.76, 43,499.32 and 18,091.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,519.76 : 43,499.32 = 18,091.60 : x
2. Step 2: Convert to fraction form
   31,519.76/43,499.32 = 18,091.60/x
3. Step 3: Cross multiply
   31,519.76x = 43,499.32 × 18,091.60
4. Step 4: Simplify right side
   31,519.76x = 786,972,297.71
5. Step 5: Solve for x
   x = 786,972,297.71/31,519.76
6. Step 6: Final answer
   x = 24,967.59