Finding the Fourth Proportional to 140,383.50, 210,515.31 and 81,259.98

Step by Step Solution

1. Step 1: Write the proportion equation
   140,383.50 : 210,515.31 = 81,259.98 : x
2. Step 2: Convert to fraction form
   140,383.50/210,515.31 = 81,259.98/x
3. Step 3: Cross multiply
   140,383.50x = 210,515.31 × 81,259.98
4. Step 4: Simplify right side
   140,383.50x = 17,106,469,880.29
5. Step 5: Solve for x
   x = 17,106,469,880.29/140,383.50
6. Step 6: Final answer
   x = 121,855.27