Finding the Third Proportional to 286,486 and 607,121.75

Step by Step Solution

1. Step 1: Write the proportion equation
   286,486 : 607,121.75 = 607,121.75 : x
2. Step 2: Convert to fraction form
   286,486/607,121.75 = 607,121.75/x
3. Step 3: Cross multiply
   286,486x = 607,121.75 × 607,121.75
4. Step 4: Simplify right side
   286,486x = 368,596,819,323.06
5. Step 5: Solve for x
   x = 368,596,819,323.06/286,486
6. Step 6: Final answer
   x = 1,286,613.72