Finding the Fourth Proportional to 259,986.84, 389,978.46 and 72,998.52

Step by Step Solution

1. Step 1: Write the proportion equation
   259,986.84 : 389,978.46 = 72,998.52 : x
2. Step 2: Convert to fraction form
   259,986.84/389,978.46 = 72,998.52/x
3. Step 3: Cross multiply
   259,986.84x = 389,978.46 × 72,998.52
4. Step 4: Simplify right side
   259,986.84x = 28,467,850,411.88
5. Step 5: Solve for x
   x = 28,467,850,411.88/259,986.84
6. Step 6: Final answer
   x = 109,497.27