Finding the Third Proportional to 91,143.50 and 142,688.75

Step by Step Solution

1. Step 1: Write the proportion equation
   91,143.50 : 142,688.75 = 142,688.75 : x
2. Step 2: Convert to fraction form
   91,143.50/142,688.75 = 142,688.75/x
3. Step 3: Cross multiply
   91,143.50x = 142,688.75 × 142,688.75
4. Step 4: Simplify right side
   91,143.50x = 20,360,079,376.56
5. Step 5: Solve for x
   x = 20,360,079,376.56/91,143.50
6. Step 6: Final answer
   x = 223,384.88