Finding the Third Proportional to 156,916 and 342,990

Step by Step Solution

1. Step 1: Write the proportion equation
   156,916 : 342,990 = 342,990 : x
2. Step 2: Convert to fraction form
   156,916/342,990 = 342,990/x
3. Step 3: Cross multiply
   156,916x = 342,990 × 342,990
4. Step 4: Simplify right side
   156,916x = 117,642,140,100
5. Step 5: Solve for x
   x = 117,642,140,100/156,916
6. Step 6: Final answer
   x = 749,714.12