Finding the Third Proportional to 128,248.50 and 191,655

Step by Step Solution

1. Step 1: Write the proportion equation
   128,248.50 : 191,655 = 191,655 : x
2. Step 2: Convert to fraction form
   128,248.50/191,655 = 191,655/x
3. Step 3: Cross multiply
   128,248.50x = 191,655 × 191,655
4. Step 4: Simplify right side
   128,248.50x = 36,731,639,025
5. Step 5: Solve for x
   x = 36,731,639,025/128,248.50
6. Step 6: Final answer
   x = 286,409.89