Finding the Third Proportional to 260,366.50 and 390,550

Step by Step Solution

1. Step 1: Write the proportion equation
   260,366.50 : 390,550 = 390,550 : x
2. Step 2: Convert to fraction form
   260,366.50/390,550 = 390,550/x
3. Step 3: Cross multiply
   260,366.50x = 390,550 × 390,550
4. Step 4: Simplify right side
   260,366.50x = 152,529,302,500
5. Step 5: Solve for x
   x = 152,529,302,500/260,366.50
6. Step 6: Final answer
   x = 585,825.38