Finding the Third Proportional to 13,128.19 and 28,807.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,128.19 : 28,807.69 = 28,807.69 : x
2. Step 2: Convert to fraction form
   13,128.19/28,807.69 = 28,807.69/x
3. Step 3: Cross multiply
   13,128.19x = 28,807.69 × 28,807.69
4. Step 4: Simplify right side
   13,128.19x = 829,882,859.10
5. Step 5: Solve for x
   x = 829,882,859.10/13,128.19
6. Step 6: Final answer
   x = 63,213.82