Finding the Third Proportional to 290,607 and 392,512.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,607 : 392,512.50 = 392,512.50 : x
2. Step 2: Convert to fraction form
   290,607/392,512.50 = 392,512.50/x
3. Step 3: Cross multiply
   290,607x = 392,512.50 × 392,512.50
4. Step 4: Simplify right side
   290,607x = 154,066,062,656.25
5. Step 5: Solve for x
   x = 154,066,062,656.25/290,607
6. Step 6: Final answer
   x = 530,152.62