Finding the Third Proportional to 57,490 and 123,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,490 : 123,721.50 = 123,721.50 : x
2. Step 2: Convert to fraction form
   57,490/123,721.50 = 123,721.50/x
3. Step 3: Cross multiply
   57,490x = 123,721.50 × 123,721.50
4. Step 4: Simplify right side
   57,490x = 15,307,009,562.25
5. Step 5: Solve for x
   x = 15,307,009,562.25/57,490
6. Step 6: Final answer
   x = 266,255.17