Finding the Third Proportional to 293,680 and 423,990

Step by Step Solution

1. Step 1: Write the proportion equation
   293,680 : 423,990 = 423,990 : x
2. Step 2: Convert to fraction form
   293,680/423,990 = 423,990/x
3. Step 3: Cross multiply
   293,680x = 423,990 × 423,990
4. Step 4: Simplify right side
   293,680x = 179,767,520,100
5. Step 5: Solve for x
   x = 179,767,520,100/293,680
6. Step 6: Final answer
   x = 612,120.40