Finding the Third Proportional to 19,920 and 29,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,920 : 29,422.50 = 29,422.50 : x
2. Step 2: Convert to fraction form
   19,920/29,422.50 = 29,422.50/x
3. Step 3: Cross multiply
   19,920x = 29,422.50 × 29,422.50
4. Step 4: Simplify right side
   19,920x = 865,683,506.25
5. Step 5: Solve for x
   x = 865,683,506.25/19,920
6. Step 6: Final answer
   x = 43,458.01