Finding the Third Proportional to 168,649.88 and 256,428

Step by Step Solution

1. Step 1: Write the proportion equation
   168,649.88 : 256,428 = 256,428 : x
2. Step 2: Convert to fraction form
   168,649.88/256,428 = 256,428/x
3. Step 3: Cross multiply
   168,649.88x = 256,428 × 256,428
4. Step 4: Simplify right side
   168,649.88x = 65,755,319,184
5. Step 5: Solve for x
   x = 65,755,319,184/168,649.88
6. Step 6: Final answer
   x = 389,892.49