Finding the Third Proportional to 874,240 and 1,390,128

Step by Step Solution

1. Step 1: Write the proportion equation
   874,240 : 1,390,128 = 1,390,128 : x
2. Step 2: Convert to fraction form
   874,240/1,390,128 = 1,390,128/x
3. Step 3: Cross multiply
   874,240x = 1,390,128 × 1,390,128
4. Step 4: Simplify right side
   874,240x = 1,932,455,856,384
5. Step 5: Solve for x
   x = 1,932,455,856,384/874,240
6. Step 6: Final answer
   x = 2,210,440.90