Finding the Fourth Proportional to 67,018.31, 99,792.89 and 64,623.54

Step by Step Solution

1. Step 1: Write the proportion equation
   67,018.31 : 99,792.89 = 64,623.54 : x
2. Step 2: Convert to fraction form
   67,018.31/99,792.89 = 64,623.54/x
3. Step 3: Cross multiply
   67,018.31x = 99,792.89 × 64,623.54
4. Step 4: Simplify right side
   67,018.31x = 6,448,969,495.51
5. Step 5: Solve for x
   x = 6,448,969,495.51/67,018.31
6. Step 6: Final answer
   x = 96,226.99