Finding the Third Proportional to 142,079.25 and 310,915.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,079.25 : 310,915.50 = 310,915.50 : x
2. Step 2: Convert to fraction form
   142,079.25/310,915.50 = 310,915.50/x
3. Step 3: Cross multiply
   142,079.25x = 310,915.50 × 310,915.50
4. Step 4: Simplify right side
   142,079.25x = 96,668,448,140.25
5. Step 5: Solve for x
   x = 96,668,448,140.25/142,079.25
6. Step 6: Final answer
   x = 680,384.00