Finding the Third Proportional to 15,511.50 and 21,141

Step by Step Solution

1. Step 1: Write the proportion equation
   15,511.50 : 21,141 = 21,141 : x
2. Step 2: Convert to fraction form
   15,511.50/21,141 = 21,141/x
3. Step 3: Cross multiply
   15,511.50x = 21,141 × 21,141
4. Step 4: Simplify right side
   15,511.50x = 446,941,881
5. Step 5: Solve for x
   x = 446,941,881/15,511.50
6. Step 6: Final answer
   x = 28,813.58