Finding the Third Proportional to 392,890.50 and 843,129

Step by Step Solution

1. Step 1: Write the proportion equation
   392,890.50 : 843,129 = 843,129 : x
2. Step 2: Convert to fraction form
   392,890.50/843,129 = 843,129/x
3. Step 3: Cross multiply
   392,890.50x = 843,129 × 843,129
4. Step 4: Simplify right side
   392,890.50x = 710,866,510,641
5. Step 5: Solve for x
   x = 710,866,510,641/392,890.50
6. Step 6: Final answer
   x = 1,809,324.76