Finding the Third Proportional to 118,521 and 258,346.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118,521 : 258,346.50 = 258,346.50 : x
2. Step 2: Convert to fraction form
   118,521/258,346.50 = 258,346.50/x
3. Step 3: Cross multiply
   118,521x = 258,346.50 × 258,346.50
4. Step 4: Simplify right side
   118,521x = 66,742,914,062.25
5. Step 5: Solve for x
   x = 66,742,914,062.25/118,521
6. Step 6: Final answer
   x = 563,131.55