Finding the Third Proportional to 81,507 and 168,090

Step by Step Solution

1. Step 1: Write the proportion equation
   81,507 : 168,090 = 168,090 : x
2. Step 2: Convert to fraction form
   81,507/168,090 = 168,090/x
3. Step 3: Cross multiply
   81,507x = 168,090 × 168,090
4. Step 4: Simplify right side
   81,507x = 28,254,248,100
5. Step 5: Solve for x
   x = 28,254,248,100/81,507
6. Step 6: Final answer
   x = 346,648.12