Finding the Fourth Proportional to 140,496.53, 210,746.78 and 45,727.21

Step by Step Solution

1. Step 1: Write the proportion equation
   140,496.53 : 210,746.78 = 45,727.21 : x
2. Step 2: Convert to fraction form
   140,496.53/210,746.78 = 45,727.21/x
3. Step 3: Cross multiply
   140,496.53x = 210,746.78 × 45,727.21
4. Step 4: Simplify right side
   140,496.53x = 9,636,861,975.89
5. Step 5: Solve for x
   x = 9,636,861,975.89/140,496.53
6. Step 6: Final answer
   x = 68,591.46