Finding the Third Proportional to 387,331 and 838,978

Step by Step Solution

1. Step 1: Write the proportion equation
   387,331 : 838,978 = 838,978 : x
2. Step 2: Convert to fraction form
   387,331/838,978 = 838,978/x
3. Step 3: Cross multiply
   387,331x = 838,978 × 838,978
4. Step 4: Simplify right side
   387,331x = 703,884,084,484
5. Step 5: Solve for x
   x = 703,884,084,484/387,331
6. Step 6: Final answer
   x = 1,817,267.62