Finding the Third Proportional to 153,615 and 319,492.50

Step by Step Solution

1. Step 1: Write the proportion equation
   153,615 : 319,492.50 = 319,492.50 : x
2. Step 2: Convert to fraction form
   153,615/319,492.50 = 319,492.50/x
3. Step 3: Cross multiply
   153,615x = 319,492.50 × 319,492.50
4. Step 4: Simplify right side
   153,615x = 102,075,457,556.25
5. Step 5: Solve for x
   x = 102,075,457,556.25/153,615
6. Step 6: Final answer
   x = 664,488.87