Finding the Third Proportional to 42,001.45 and 90,688.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,001.45 : 90,688.78 = 90,688.78 : x
2. Step 2: Convert to fraction form
   42,001.45/90,688.78 = 90,688.78/x
3. Step 3: Cross multiply
   42,001.45x = 90,688.78 × 90,688.78
4. Step 4: Simplify right side
   42,001.45x = 8,224,455,044.61
5. Step 5: Solve for x
   x = 8,224,455,044.61/42,001.45
6. Step 6: Final answer
   x = 195,813.58