Finding the Third Proportional to 112,640 and 243,136

Step by Step Solution

1. Step 1: Write the proportion equation
   112,640 : 243,136 = 243,136 : x
2. Step 2: Convert to fraction form
   112,640/243,136 = 243,136/x
3. Step 3: Cross multiply
   112,640x = 243,136 × 243,136
4. Step 4: Simplify right side
   112,640x = 59,115,114,496
5. Step 5: Solve for x
   x = 59,115,114,496/112,640
6. Step 6: Final answer
   x = 524,814.58