Finding the Third Proportional to 20,916.38 and 31,420.88

Step by Step Solution

1. Step 1: Write the proportion equation
   20,916.38 : 31,420.88 = 31,420.88 : x
2. Step 2: Convert to fraction form
   20,916.38/31,420.88 = 31,420.88/x
3. Step 3: Cross multiply
   20,916.38x = 31,420.88 × 31,420.88
4. Step 4: Simplify right side
   20,916.38x = 987,271,385.77
5. Step 5: Solve for x
   x = 987,271,385.77/20,916.38
6. Step 6: Final answer
   x = 47,200.88