Finding the Third Proportional to 316,807.50 and 656,071.50

Step by Step Solution

1. Step 1: Write the proportion equation
   316,807.50 : 656,071.50 = 656,071.50 : x
2. Step 2: Convert to fraction form
   316,807.50/656,071.50 = 656,071.50/x
3. Step 3: Cross multiply
   316,807.50x = 656,071.50 × 656,071.50
4. Step 4: Simplify right side
   316,807.50x = 430,429,813,112.25
5. Step 5: Solve for x
   x = 430,429,813,112.25/316,807.50
6. Step 6: Final answer
   x = 1,358,647.80