Finding the Third Proportional to 13,521.94 and 15,931.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,521.94 : 15,931.69 = 15,931.69 : x
2. Step 2: Convert to fraction form
   13,521.94/15,931.69 = 15,931.69/x
3. Step 3: Cross multiply
   13,521.94x = 15,931.69 × 15,931.69
4. Step 4: Simplify right side
   13,521.94x = 253,818,666.60
5. Step 5: Solve for x
   x = 253,818,666.60/13,521.94
6. Step 6: Final answer
   x = 18,770.88