Finding the Third Proportional to 78,613.50 and 111,129

Step by Step Solution

1. Step 1: Write the proportion equation
   78,613.50 : 111,129 = 111,129 : x
2. Step 2: Convert to fraction form
   78,613.50/111,129 = 111,129/x
3. Step 3: Cross multiply
   78,613.50x = 111,129 × 111,129
4. Step 4: Simplify right side
   78,613.50x = 12,349,654,641
5. Step 5: Solve for x
   x = 12,349,654,641/78,613.50
6. Step 6: Final answer
   x = 157,093.31