Finding the Third Proportional to 197.30 and 428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   197.30 : 428.72 = 428.72 : x
2. Step 2: Convert to fraction form
   197.30/428.72 = 428.72/x
3. Step 3: Cross multiply
   197.30x = 428.72 × 428.72
4. Step 4: Simplify right side
   197.30x = 183,799.77
5. Step 5: Solve for x
   x = 183,799.77/197.30
6. Step 6: Final answer
   x = 931.59