Finding the Fourth Proportional to 259,860.68, 389,790.42 and 101,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   259,860.68 : 389,790.42 = 101,978.72 : x
2. Step 2: Convert to fraction form
   259,860.68/389,790.42 = 101,978.72/x
3. Step 3: Cross multiply
   259,860.68x = 389,790.42 × 101,978.72
4. Step 4: Simplify right side
   259,860.68x = 39,750,328,099.86
5. Step 5: Solve for x
   x = 39,750,328,099.86/259,860.68
6. Step 6: Final answer
   x = 152,967.84