Finding the Third Proportional to 120,042 and 258,298.88

Step by Step Solution

1. Step 1: Write the proportion equation
   120,042 : 258,298.88 = 258,298.88 : x
2. Step 2: Convert to fraction form
   120,042/258,298.88 = 258,298.88/x
3. Step 3: Cross multiply
   120,042x = 258,298.88 × 258,298.88
4. Step 4: Simplify right side
   120,042x = 66,718,308,826.27
5. Step 5: Solve for x
   x = 66,718,308,826.27/120,042
6. Step 6: Final answer
   x = 555,791.38