Finding the Third Proportional to 128,076.19 and 278,300.81

Step by Step Solution

1. Step 1: Write the proportion equation
   128,076.19 : 278,300.81 = 278,300.81 : x
2. Step 2: Convert to fraction form
   128,076.19/278,300.81 = 278,300.81/x
3. Step 3: Cross multiply
   128,076.19x = 278,300.81 × 278,300.81
4. Step 4: Simplify right side
   128,076.19x = 77,451,342,238.16
5. Step 5: Solve for x
   x = 77,451,342,238.16/128,076.19
6. Step 6: Final answer
   x = 604,728.67