Finding the Third Proportional to 42,423 and 89,490

Step by Step Solution

1. Step 1: Write the proportion equation
   42,423 : 89,490 = 89,490 : x
2. Step 2: Convert to fraction form
   42,423/89,490 = 89,490/x
3. Step 3: Cross multiply
   42,423x = 89,490 × 89,490
4. Step 4: Simplify right side
   42,423x = 8,008,460,100
5. Step 5: Solve for x
   x = 8,008,460,100/42,423
6. Step 6: Final answer
   x = 188,776.37