Finding the Third Proportional to 191,448 and 392,440

Step by Step Solution

1. Step 1: Write the proportion equation
   191,448 : 392,440 = 392,440 : x
2. Step 2: Convert to fraction form
   191,448/392,440 = 392,440/x
3. Step 3: Cross multiply
   191,448x = 392,440 × 392,440
4. Step 4: Simplify right side
   191,448x = 154,009,153,600
5. Step 5: Solve for x
   x = 154,009,153,600/191,448
6. Step 6: Final answer
   x = 804,443.78