Finding the Fourth Proportional to 259,210.88, 357,711.01 and 139,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   259,210.88 : 357,711.01 = 139,978.88 : x
2. Step 2: Convert to fraction form
   259,210.88/357,711.01 = 139,978.88/x
3. Step 3: Cross multiply
   259,210.88x = 357,711.01 × 139,978.88
4. Step 4: Simplify right side
   259,210.88x = 50,071,984,404.97
5. Step 5: Solve for x
   x = 50,071,984,404.97/259,210.88
6. Step 6: Final answer
   x = 193,170.85