Finding the Third Proportional to 689,311 and 992,818.50

Step by Step Solution

1. Step 1: Write the proportion equation
   689,311 : 992,818.50 = 992,818.50 : x
2. Step 2: Convert to fraction form
   689,311/992,818.50 = 992,818.50/x
3. Step 3: Cross multiply
   689,311x = 992,818.50 × 992,818.50
4. Step 4: Simplify right side
   689,311x = 985,688,573,942.25
5. Step 5: Solve for x
   x = 985,688,573,942.25/689,311
6. Step 6: Final answer
   x = 1,429,962.05