Finding the Third Proportional to 402,783,178 and 867,543,196

Step by Step Solution

1. Step 1: Write the proportion equation
   402,783,178 : 867,543,196 = 867,543,196 : x
2. Step 2: Convert to fraction form
   402,783,178/867,543,196 = 867,543,196/x
3. Step 3: Cross multiply
   402,783,178x = 867,543,196 × 867,543,196
4. Step 4: Simplify right side
   402,783,178x = 752,631,196,925,894,400
5. Step 5: Solve for x
   x = 752,631,196,925,894,400/402,783,178
6. Step 6: Final answer
   x = 1,868,576,539.52