Finding the Third Proportional to 311,017.50 and 666,261

Step by Step Solution

1. Step 1: Write the proportion equation
   311,017.50 : 666,261 = 666,261 : x
2. Step 2: Convert to fraction form
   311,017.50/666,261 = 666,261/x
3. Step 3: Cross multiply
   311,017.50x = 666,261 × 666,261
4. Step 4: Simplify right side
   311,017.50x = 443,903,720,121
5. Step 5: Solve for x
   x = 443,903,720,121/311,017.50
6. Step 6: Final answer
   x = 1,427,262.84