Finding the Third Proportional to 118,588.50 and 256,860

Step by Step Solution

1. Step 1: Write the proportion equation
   118,588.50 : 256,860 = 256,860 : x
2. Step 2: Convert to fraction form
   118,588.50/256,860 = 256,860/x
3. Step 3: Cross multiply
   118,588.50x = 256,860 × 256,860
4. Step 4: Simplify right side
   118,588.50x = 65,977,059,600
5. Step 5: Solve for x
   x = 65,977,059,600/118,588.50
6. Step 6: Final answer
   x = 556,352.93