Finding the Third Proportional to 90,312 and 140,638.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,312 : 140,638.50 = 140,638.50 : x
2. Step 2: Convert to fraction form
   90,312/140,638.50 = 140,638.50/x
3. Step 3: Cross multiply
   90,312x = 140,638.50 × 140,638.50
4. Step 4: Simplify right side
   90,312x = 19,779,187,682.25
5. Step 5: Solve for x
   x = 19,779,187,682.25/90,312
6. Step 6: Final answer
   x = 219,009.52