Finding the Fourth Proportional to 51,665.60, 71,289.78 and 30,449.06

Step by Step Solution

1. Step 1: Write the proportion equation
   51,665.60 : 71,289.78 = 30,449.06 : x
2. Step 2: Convert to fraction form
   51,665.60/71,289.78 = 30,449.06/x
3. Step 3: Cross multiply
   51,665.60x = 71,289.78 × 30,449.06
4. Step 4: Simplify right side
   51,665.60x = 2,170,706,788.61
5. Step 5: Solve for x
   x = 2,170,706,788.61/51,665.60
6. Step 6: Final answer
   x = 42,014.55