Finding the Third Proportional to 442,790 and 917,090

Step by Step Solution

1. Step 1: Write the proportion equation
   442,790 : 917,090 = 917,090 : x
2. Step 2: Convert to fraction form
   442,790/917,090 = 917,090/x
3. Step 3: Cross multiply
   442,790x = 917,090 × 917,090
4. Step 4: Simplify right side
   442,790x = 841,054,068,100
5. Step 5: Solve for x
   x = 841,054,068,100/442,790
6. Step 6: Final answer
   x = 1,899,442.33