Finding the Third Proportional to 258,513 and 388,042.88

Step by Step Solution

1. Step 1: Write the proportion equation
   258,513 : 388,042.88 = 388,042.88 : x
2. Step 2: Convert to fraction form
   258,513/388,042.88 = 388,042.88/x
3. Step 3: Cross multiply
   258,513x = 388,042.88 × 388,042.88
4. Step 4: Simplify right side
   258,513x = 150,577,272,838.27
5. Step 5: Solve for x
   x = 150,577,272,838.27/258,513
6. Step 6: Final answer
   x = 582,474.66