Finding the Third Proportional to 553,380 and 846,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   553,380 : 846,128.25 = 846,128.25 : x
2. Step 2: Convert to fraction form
   553,380/846,128.25 = 846,128.25/x
3. Step 3: Cross multiply
   553,380x = 846,128.25 × 846,128.25
4. Step 4: Simplify right side
   553,380x = 715,933,015,448.06
5. Step 5: Solve for x
   x = 715,933,015,448.06/553,380
6. Step 6: Final answer
   x = 1,293,745.74