Finding the Third Proportional to 42,789.75 and 90,358.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.75 : 90,358.50 = 90,358.50 : x
2. Step 2: Convert to fraction form
   42,789.75/90,358.50 = 90,358.50/x
3. Step 3: Cross multiply
   42,789.75x = 90,358.50 × 90,358.50
4. Step 4: Simplify right side
   42,789.75x = 8,164,658,522.25
5. Step 5: Solve for x
   x = 8,164,658,522.25/42,789.75
6. Step 6: Final answer
   x = 190,808.75