Finding the Third Proportional to 181,570 and 390,780

Step by Step Solution

1. Step 1: Write the proportion equation
   181,570 : 390,780 = 390,780 : x
2. Step 2: Convert to fraction form
   181,570/390,780 = 390,780/x
3. Step 3: Cross multiply
   181,570x = 390,780 × 390,780
4. Step 4: Simplify right side
   181,570x = 152,709,008,400
5. Step 5: Solve for x
   x = 152,709,008,400/181,570
6. Step 6: Final answer
   x = 841,047.58