Finding the Third Proportional to 290,605.50 and 390,528

Step by Step Solution

1. Step 1: Write the proportion equation
   290,605.50 : 390,528 = 390,528 : x
2. Step 2: Convert to fraction form
   290,605.50/390,528 = 390,528/x
3. Step 3: Cross multiply
   290,605.50x = 390,528 × 390,528
4. Step 4: Simplify right side
   290,605.50x = 152,512,118,784
5. Step 5: Solve for x
   x = 152,512,118,784/290,605.50
6. Step 6: Final answer
   x = 524,808.09