Finding the Third Proportional to 286,312.50 and 442,920

Step by Step Solution

1. Step 1: Write the proportion equation
   286,312.50 : 442,920 = 442,920 : x
2. Step 2: Convert to fraction form
   286,312.50/442,920 = 442,920/x
3. Step 3: Cross multiply
   286,312.50x = 442,920 × 442,920
4. Step 4: Simplify right side
   286,312.50x = 196,178,126,400
5. Step 5: Solve for x
   x = 196,178,126,400/286,312.50
6. Step 6: Final answer
   x = 685,188.83