Finding the Third Proportional to 117,109.50 and 260,421

Step by Step Solution

1. Step 1: Write the proportion equation
   117,109.50 : 260,421 = 260,421 : x
2. Step 2: Convert to fraction form
   117,109.50/260,421 = 260,421/x
3. Step 3: Cross multiply
   117,109.50x = 260,421 × 260,421
4. Step 4: Simplify right side
   117,109.50x = 67,819,097,241
5. Step 5: Solve for x
   x = 67,819,097,241/117,109.50
6. Step 6: Final answer
   x = 579,108.42