Finding the Fourth Proportional to 259,985.34, 389,976.21 and 72,997.02

Step by Step Solution

1. Step 1: Write the proportion equation
   259,985.34 : 389,976.21 = 72,997.02 : x
2. Step 2: Convert to fraction form
   259,985.34/389,976.21 = 72,997.02/x
3. Step 3: Cross multiply
   259,985.34x = 389,976.21 × 72,997.02
4. Step 4: Simplify right side
   259,985.34x = 28,467,101,200.89
5. Step 5: Solve for x
   x = 28,467,101,200.89/259,985.34
6. Step 6: Final answer
   x = 109,495.02