Finding the Third Proportional to 221,439 and 312,043.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,439 : 312,043.50 = 312,043.50 : x
2. Step 2: Convert to fraction form
   221,439/312,043.50 = 312,043.50/x
3. Step 3: Cross multiply
   221,439x = 312,043.50 × 312,043.50
4. Step 4: Simplify right side
   221,439x = 97,371,145,892.25
5. Step 5: Solve for x
   x = 97,371,145,892.25/221,439
6. Step 6: Final answer
   x = 439,719.95