Finding the Third Proportional to 428,157.75 and 920,899.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,157.75 : 920,899.50 = 920,899.50 : x
2. Step 2: Convert to fraction form
   428,157.75/920,899.50 = 920,899.50/x
3. Step 3: Cross multiply
   428,157.75x = 920,899.50 × 920,899.50
4. Step 4: Simplify right side
   428,157.75x = 848,055,889,100.25
5. Step 5: Solve for x
   x = 848,055,889,100.25/428,157.75
6. Step 6: Final answer
   x = 1,980,708.95