Finding the Third Proportional to 645,649,117 and 905,973,523.50

Step by Step Solution

1. Step 1: Write the proportion equation
   645,649,117 : 905,973,523.50 = 905,973,523.50 : x
2. Step 2: Convert to fraction form
   645,649,117/905,973,523.50 = 905,973,523.50/x
3. Step 3: Cross multiply
   645,649,117x = 905,973,523.50 × 905,973,523.50
4. Step 4: Simplify right side
   645,649,117x = 820,788,025,283,005,056
5. Step 5: Solve for x
   x = 820,788,025,283,005,056/645,649,117
6. Step 6: Final answer
   x = 1,271,260,199.50