Finding the Third Proportional to 379,991.25 and 813,078

Step by Step Solution

1. Step 1: Write the proportion equation
   379,991.25 : 813,078 = 813,078 : x
2. Step 2: Convert to fraction form
   379,991.25/813,078 = 813,078/x
3. Step 3: Cross multiply
   379,991.25x = 813,078 × 813,078
4. Step 4: Simplify right side
   379,991.25x = 661,095,834,084
5. Step 5: Solve for x
   x = 661,095,834,084/379,991.25
6. Step 6: Final answer
   x = 1,739,765.94