Finding the Third Proportional to 252,090 and 390,529.50

Step by Step Solution

1. Step 1: Write the proportion equation
   252,090 : 390,529.50 = 390,529.50 : x
2. Step 2: Convert to fraction form
   252,090/390,529.50 = 390,529.50/x
3. Step 3: Cross multiply
   252,090x = 390,529.50 × 390,529.50
4. Step 4: Simplify right side
   252,090x = 152,513,290,370.25
5. Step 5: Solve for x
   x = 152,513,290,370.25/252,090
6. Step 6: Final answer
   x = 604,995.40