Finding the Third Proportional to 156,828 and 342,090

Step by Step Solution

1. Step 1: Write the proportion equation
   156,828 : 342,090 = 342,090 : x
2. Step 2: Convert to fraction form
   156,828/342,090 = 342,090/x
3. Step 3: Cross multiply
   156,828x = 342,090 × 342,090
4. Step 4: Simplify right side
   156,828x = 117,025,568,100
5. Step 5: Solve for x
   x = 117,025,568,100/156,828
6. Step 6: Final answer
   x = 746,203.28