Finding the Fourth Proportional to 259,372.35, 389,025.72 and 81,897.30

Step by Step Solution

1. Step 1: Write the proportion equation
   259,372.35 : 389,025.72 = 81,897.30 : x
2. Step 2: Convert to fraction form
   259,372.35/389,025.72 = 81,897.30/x
3. Step 3: Cross multiply
   259,372.35x = 389,025.72 × 81,897.30
4. Step 4: Simplify right side
   259,372.35x = 31,860,156,098.56
5. Step 5: Solve for x
   x = 31,860,156,098.56/259,372.35
6. Step 6: Final answer
   x = 122,835.59