Finding the Third Proportional to 290,439.50 and 629,129

Step by Step Solution

1. Step 1: Write the proportion equation
   290,439.50 : 629,129 = 629,129 : x
2. Step 2: Convert to fraction form
   290,439.50/629,129 = 629,129/x
3. Step 3: Cross multiply
   290,439.50x = 629,129 × 629,129
4. Step 4: Simplify right side
   290,439.50x = 395,803,298,641
5. Step 5: Solve for x
   x = 395,803,298,641/290,439.50
6. Step 6: Final answer
   x = 1,362,773.65