Finding the Third Proportional to 286,389 and 437,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   286,389 : 437,116.50 = 437,116.50 : x
2. Step 2: Convert to fraction form
   286,389/437,116.50 = 437,116.50/x
3. Step 3: Cross multiply
   286,389x = 437,116.50 × 437,116.50
4. Step 4: Simplify right side
   286,389x = 191,070,834,572.25
5. Step 5: Solve for x
   x = 191,070,834,572.25/286,389
6. Step 6: Final answer
   x = 667,172.39