Finding the Third Proportional to 988,490 and 2,158,258

Step by Step Solution

1. Step 1: Write the proportion equation
   988,490 : 2,158,258 = 2,158,258 : x
2. Step 2: Convert to fraction form
   988,490/2,158,258 = 2,158,258/x
3. Step 3: Cross multiply
   988,490x = 2,158,258 × 2,158,258
4. Step 4: Simplify right side
   988,490x = 4,658,077,594,564
5. Step 5: Solve for x
   x = 4,658,077,594,564/988,490
6. Step 6: Final answer
   x = 4,712,316.36