Finding the Third Proportional to 293,136 and 638,758.50

Step by Step Solution

1. Step 1: Write the proportion equation
   293,136 : 638,758.50 = 638,758.50 : x
2. Step 2: Convert to fraction form
   293,136/638,758.50 = 638,758.50/x
3. Step 3: Cross multiply
   293,136x = 638,758.50 × 638,758.50
4. Step 4: Simplify right side
   293,136x = 408,012,421,322.25
5. Step 5: Solve for x
   x = 408,012,421,322.25/293,136
6. Step 6: Final answer
   x = 1,391,887.80