Finding the Third Proportional to 139,458.52 and 286,267.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,458.52 : 286,267.78 = 286,267.78 : x
2. Step 2: Convert to fraction form
   139,458.52/286,267.78 = 286,267.78/x
3. Step 3: Cross multiply
   139,458.52x = 286,267.78 × 286,267.78
4. Step 4: Simplify right side
   139,458.52x = 81,949,242,581.80
5. Step 5: Solve for x
   x = 81,949,242,581.80/139,458.52
6. Step 6: Final answer
   x = 587,624.51