Finding the Fourth Proportional to 105,018.57, 144,928.51 and 64,189.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,018.57 : 144,928.51 = 64,189.31 : x
2. Step 2: Convert to fraction form
   105,018.57/144,928.51 = 64,189.31/x
3. Step 3: Cross multiply
   105,018.57x = 144,928.51 × 64,189.31
4. Step 4: Simplify right side
   105,018.57x = 9,302,860,171.11
5. Step 5: Solve for x
   x = 9,302,860,171.11/105,018.57
6. Step 6: Final answer
   x = 88,583.00