Finding the Third Proportional to 147,055.50 and 318,168

Step by Step Solution

1. Step 1: Write the proportion equation
   147,055.50 : 318,168 = 318,168 : x
2. Step 2: Convert to fraction form
   147,055.50/318,168 = 318,168/x
3. Step 3: Cross multiply
   147,055.50x = 318,168 × 318,168
4. Step 4: Simplify right side
   147,055.50x = 101,230,876,224
5. Step 5: Solve for x
   x = 101,230,876,224/147,055.50
6. Step 6: Final answer
   x = 688,385.52