Finding the Third Proportional to 78,511.50 and 112,139

Step by Step Solution

1. Step 1: Write the proportion equation
   78,511.50 : 112,139 = 112,139 : x
2. Step 2: Convert to fraction form
   78,511.50/112,139 = 112,139/x
3. Step 3: Cross multiply
   78,511.50x = 112,139 × 112,139
4. Step 4: Simplify right side
   78,511.50x = 12,575,155,321
5. Step 5: Solve for x
   x = 12,575,155,321/78,511.50
6. Step 6: Final answer
   x = 160,169.60