Finding the Fourth Proportional to 259,417.50, 357,996.15 and 140,185.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,417.50 : 357,996.15 = 140,185.50 : x
2. Step 2: Convert to fraction form
   259,417.50/357,996.15 = 140,185.50/x
3. Step 3: Cross multiply
   259,417.50x = 357,996.15 × 140,185.50
4. Step 4: Simplify right side
   259,417.50x = 50,185,869,285.83
5. Step 5: Solve for x
   x = 50,185,869,285.83/259,417.50
6. Step 6: Final answer
   x = 193,455.99