Finding the Third Proportional to 243,090 and 384,612

Step by Step Solution

1. Step 1: Write the proportion equation
   243,090 : 384,612 = 384,612 : x
2. Step 2: Convert to fraction form
   243,090/384,612 = 384,612/x
3. Step 3: Cross multiply
   243,090x = 384,612 × 384,612
4. Step 4: Simplify right side
   243,090x = 147,926,390,544
5. Step 5: Solve for x
   x = 147,926,390,544/243,090
6. Step 6: Final answer
   x = 608,525.20