Finding the Third Proportional to 402,783,138 and 867,543,118

Step by Step Solution

1. Step 1: Write the proportion equation
   402,783,138 : 867,543,118 = 867,543,118 : x
2. Step 2: Convert to fraction form
   402,783,138/867,543,118 = 867,543,118/x
3. Step 3: Cross multiply
   402,783,138x = 867,543,118 × 867,543,118
4. Step 4: Simplify right side
   402,783,138x = 752,631,061,589,161,984
5. Step 5: Solve for x
   x = 752,631,061,589,161,984/402,783,138
6. Step 6: Final answer
   x = 1,868,576,389.09