Finding the Third Proportional to 218,706 and 357,124.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,706 : 357,124.50 = 357,124.50 : x
2. Step 2: Convert to fraction form
   218,706/357,124.50 = 357,124.50/x
3. Step 3: Cross multiply
   218,706x = 357,124.50 × 357,124.50
4. Step 4: Simplify right side
   218,706x = 127,537,908,500.25
5. Step 5: Solve for x
   x = 127,537,908,500.25/218,706
6. Step 6: Final answer
   x = 583,147.73