Finding the Third Proportional to 705,258 and 990,985.50

Step by Step Solution

1. Step 1: Write the proportion equation
   705,258 : 990,985.50 = 990,985.50 : x
2. Step 2: Convert to fraction form
   705,258/990,985.50 = 990,985.50/x
3. Step 3: Cross multiply
   705,258x = 990,985.50 × 990,985.50
4. Step 4: Simplify right side
   705,258x = 982,052,261,210.25
5. Step 5: Solve for x
   x = 982,052,261,210.25/705,258
6. Step 6: Final answer
   x = 1,392,472.35