Finding the Third Proportional to 655,389 and 987,709.50

Step by Step Solution

1. Step 1: Write the proportion equation
   655,389 : 987,709.50 = 987,709.50 : x
2. Step 2: Convert to fraction form
   655,389/987,709.50 = 987,709.50/x
3. Step 3: Cross multiply
   655,389x = 987,709.50 × 987,709.50
4. Step 4: Simplify right side
   655,389x = 975,570,056,390.25
5. Step 5: Solve for x
   x = 975,570,056,390.25/655,389
6. Step 6: Final answer
   x = 1,488,535.90