Finding the Third Proportional to 78,139 and 168,143

Step by Step Solution

1. Step 1: Write the proportion equation
   78,139 : 168,143 = 168,143 : x
2. Step 2: Convert to fraction form
   78,139/168,143 = 168,143/x
3. Step 3: Cross multiply
   78,139x = 168,143 × 168,143
4. Step 4: Simplify right side
   78,139x = 28,272,068,449
5. Step 5: Solve for x
   x = 28,272,068,449/78,139
6. Step 6: Final answer
   x = 361,817.64