Finding the Fourth Proportional to 259,723.89, 389,600.61 and 72,749.97

Step by Step Solution

1. Step 1: Write the proportion equation
   259,723.89 : 389,600.61 = 72,749.97 : x
2. Step 2: Convert to fraction form
   259,723.89/389,600.61 = 72,749.97/x
3. Step 3: Cross multiply
   259,723.89x = 389,600.61 × 72,749.97
4. Step 4: Simplify right side
   259,723.89x = 28,343,432,689.48
5. Step 5: Solve for x
   x = 28,343,432,689.48/259,723.89
6. Step 6: Final answer
   x = 109,129.09