Finding the Third Proportional to 521,390 and 1,142,440

Step by Step Solution

1. Step 1: Write the proportion equation
   521,390 : 1,142,440 = 1,142,440 : x
2. Step 2: Convert to fraction form
   521,390/1,142,440 = 1,142,440/x
3. Step 3: Cross multiply
   521,390x = 1,142,440 × 1,142,440
4. Step 4: Simplify right side
   521,390x = 1,305,169,153,600
5. Step 5: Solve for x
   x = 1,305,169,153,600/521,390
6. Step 6: Final answer
   x = 2,503,249.30