Finding the Third Proportional to 120,271.50 and 258,312

Step by Step Solution

1. Step 1: Write the proportion equation
   120,271.50 : 258,312 = 258,312 : x
2. Step 2: Convert to fraction form
   120,271.50/258,312 = 258,312/x
3. Step 3: Cross multiply
   120,271.50x = 258,312 × 258,312
4. Step 4: Simplify right side
   120,271.50x = 66,725,089,344
5. Step 5: Solve for x
   x = 66,725,089,344/120,271.50
6. Step 6: Final answer
   x = 554,787.21