Finding the Fourth Proportional to 259,081.72, 388,636.50 and 81,602.62

Step by Step Solution

1. Step 1: Write the proportion equation
   259,081.72 : 388,636.50 = 81,602.62 : x
2. Step 2: Convert to fraction form
   259,081.72/388,636.50 = 81,602.62/x
3. Step 3: Cross multiply
   259,081.72x = 388,636.50 × 81,602.62
4. Step 4: Simplify right side
   259,081.72x = 31,713,756,627.63
5. Step 5: Solve for x
   x = 31,713,756,627.63/259,081.72
6. Step 6: Final answer
   x = 122,408.31