Finding the Third Proportional to 21,213 and 30,158.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,213 : 30,158.25 = 30,158.25 : x
2. Step 2: Convert to fraction form
   21,213/30,158.25 = 30,158.25/x
3. Step 3: Cross multiply
   21,213x = 30,158.25 × 30,158.25
4. Step 4: Simplify right side
   21,213x = 909,520,043.06
5. Step 5: Solve for x
   x = 909,520,043.06/21,213
6. Step 6: Final answer
   x = 42,875.60