Finding the Third Proportional to 187,792 and 405,090

Step by Step Solution

1. Step 1: Write the proportion equation
   187,792 : 405,090 = 405,090 : x
2. Step 2: Convert to fraction form
   187,792/405,090 = 405,090/x
3. Step 3: Cross multiply
   187,792x = 405,090 × 405,090
4. Step 4: Simplify right side
   187,792x = 164,097,908,100
5. Step 5: Solve for x
   x = 164,097,908,100/187,792
6. Step 6: Final answer
   x = 873,828.00