Finding the Fourth Proportional to 259,100.86, 388,665.20 and 81,621.76

Step by Step Solution

1. Step 1: Write the proportion equation
   259,100.86 : 388,665.20 = 81,621.76 : x
2. Step 2: Convert to fraction form
   259,100.86/388,665.20 = 81,621.76/x
3. Step 3: Cross multiply
   259,100.86x = 388,665.20 × 81,621.76
4. Step 4: Simplify right side
   259,100.86x = 31,723,537,674.75
5. Step 5: Solve for x
   x = 31,723,537,674.75/259,100.86
6. Step 6: Final answer
   x = 122,437.02