Finding the Third Proportional to 72,990 and 105,475.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,990 : 105,475.50 = 105,475.50 : x
2. Step 2: Convert to fraction form
   72,990/105,475.50 = 105,475.50/x
3. Step 3: Cross multiply
   72,990x = 105,475.50 × 105,475.50
4. Step 4: Simplify right side
   72,990x = 11,125,081,100.25
5. Step 5: Solve for x
   x = 11,125,081,100.25/72,990
6. Step 6: Final answer
   x = 152,419.25