Finding the Third Proportional to 421,340 and 921,505.75

Step by Step Solution

1. Step 1: Write the proportion equation
   421,340 : 921,505.75 = 921,505.75 : x
2. Step 2: Convert to fraction form
   421,340/921,505.75 = 921,505.75/x
3. Step 3: Cross multiply
   421,340x = 921,505.75 × 921,505.75
4. Step 4: Simplify right side
   421,340x = 849,172,847,283.06
5. Step 5: Solve for x
   x = 849,172,847,283.06/421,340
6. Step 6: Final answer
   x = 2,015,409.99