Finding the Third Proportional to 148,117.50 and 215,453

Step by Step Solution

1. Step 1: Write the proportion equation
   148,117.50 : 215,453 = 215,453 : x
2. Step 2: Convert to fraction form
   148,117.50/215,453 = 215,453/x
3. Step 3: Cross multiply
   148,117.50x = 215,453 × 215,453
4. Step 4: Simplify right side
   148,117.50x = 46,419,995,209
5. Step 5: Solve for x
   x = 46,419,995,209/148,117.50
6. Step 6: Final answer
   x = 313,399.80