Finding the Third Proportional to 175,667.25 and 390,639

Step by Step Solution

1. Step 1: Write the proportion equation
   175,667.25 : 390,639 = 390,639 : x
2. Step 2: Convert to fraction form
   175,667.25/390,639 = 390,639/x
3. Step 3: Cross multiply
   175,667.25x = 390,639 × 390,639
4. Step 4: Simplify right side
   175,667.25x = 152,598,828,321
5. Step 5: Solve for x
   x = 152,598,828,321/175,667.25
6. Step 6: Final answer
   x = 868,681.15