Finding the Third Proportional to 318,654 and 432,985.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,654 : 432,985.50 = 432,985.50 : x
2. Step 2: Convert to fraction form
   318,654/432,985.50 = 432,985.50/x
3. Step 3: Cross multiply
   318,654x = 432,985.50 × 432,985.50
4. Step 4: Simplify right side
   318,654x = 187,476,443,210.25
5. Step 5: Solve for x
   x = 187,476,443,210.25/318,654
6. Step 6: Final answer
   x = 588,338.58