Finding the Third Proportional to 252,154 and 390,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   252,154 : 390,421.50 = 390,421.50 : x
2. Step 2: Convert to fraction form
   252,154/390,421.50 = 390,421.50/x
3. Step 3: Cross multiply
   252,154x = 390,421.50 × 390,421.50
4. Step 4: Simplify right side
   252,154x = 152,428,947,662.25
5. Step 5: Solve for x
   x = 152,428,947,662.25/252,154
6. Step 6: Final answer
   x = 604,507.36