Finding the Third Proportional to 252,089.50 and 390,528

Step by Step Solution

1. Step 1: Write the proportion equation
   252,089.50 : 390,528 = 390,528 : x
2. Step 2: Convert to fraction form
   252,089.50/390,528 = 390,528/x
3. Step 3: Cross multiply
   252,089.50x = 390,528 × 390,528
4. Step 4: Simplify right side
   252,089.50x = 152,512,118,784
5. Step 5: Solve for x
   x = 152,512,118,784/252,089.50
6. Step 6: Final answer
   x = 604,991.95