Finding the Third Proportional to 78,921 and 118,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,921 : 118,111.50 = 118,111.50 : x
2. Step 2: Convert to fraction form
   78,921/118,111.50 = 118,111.50/x
3. Step 3: Cross multiply
   78,921x = 118,111.50 × 118,111.50
4. Step 4: Simplify right side
   78,921x = 13,950,326,432.25
5. Step 5: Solve for x
   x = 13,950,326,432.25/78,921
6. Step 6: Final answer
   x = 176,763.17