Finding the Third Proportional to 128,782.13 and 282,168

Step by Step Solution

1. Step 1: Write the proportion equation
   128,782.13 : 282,168 = 282,168 : x
2. Step 2: Convert to fraction form
   128,782.13/282,168 = 282,168/x
3. Step 3: Cross multiply
   128,782.13x = 282,168 × 282,168
4. Step 4: Simplify right side
   128,782.13x = 79,618,780,224
5. Step 5: Solve for x
   x = 79,618,780,224/128,782.13
6. Step 6: Final answer
   x = 618,244.03