Finding the Fourth Proportional to 31,719.15, 43,774.20 and 18,111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,719.15 : 43,774.20 = 18,111.21 : x
2. Step 2: Convert to fraction form
   31,719.15/43,774.20 = 18,111.21/x
3. Step 3: Cross multiply
   31,719.15x = 43,774.20 × 18,111.21
4. Step 4: Simplify right side
   31,719.15x = 792,803,728.78
5. Step 5: Solve for x
   x = 792,803,728.78/31,719.15
6. Step 6: Final answer
   x = 24,994.48