Finding the Third Proportional to 402,783,139 and 867,543,117

Step by Step Solution

1. Step 1: Write the proportion equation
   402,783,139 : 867,543,117 = 867,543,117 : x
2. Step 2: Convert to fraction form
   402,783,139/867,543,117 = 867,543,117/x
3. Step 3: Cross multiply
   402,783,139x = 867,543,117 × 867,543,117
4. Step 4: Simplify right side
   402,783,139x = 752,631,059,854,075,648
5. Step 5: Solve for x
   x = 752,631,059,854,075,648/402,783,139
6. Step 6: Final answer
   x = 1,868,576,380.14