Finding the Third Proportional to 139,452 and 287,158

Step by Step Solution

1. Step 1: Write the proportion equation
   139,452 : 287,158 = 287,158 : x
2. Step 2: Convert to fraction form
   139,452/287,158 = 287,158/x
3. Step 3: Cross multiply
   139,452x = 287,158 × 287,158
4. Step 4: Simplify right side
   139,452x = 82,459,716,964
5. Step 5: Solve for x
   x = 82,459,716,964/139,452
6. Step 6: Final answer
   x = 591,312.54