Finding the Fourth Proportional to 30,419.76, 41,980.91 and 16,991.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,419.76 : 41,980.91 = 16,991.31 : x
2. Step 2: Convert to fraction form
   30,419.76/41,980.91 = 16,991.31/x
3. Step 3: Cross multiply
   30,419.76x = 41,980.91 × 16,991.31
4. Step 4: Simplify right side
   30,419.76x = 713,310,655.89
5. Step 5: Solve for x
   x = 713,310,655.89/30,419.76
6. Step 6: Final answer
   x = 23,448.92