Finding the Fourth Proportional to 105,156.09, 145,068.03 and 64,871.55

Step by Step Solution

1. Step 1: Write the proportion equation
   105,156.09 : 145,068.03 = 64,871.55 : x
2. Step 2: Convert to fraction form
   105,156.09/145,068.03 = 64,871.55/x
3. Step 3: Cross multiply
   105,156.09x = 145,068.03 × 64,871.55
4. Step 4: Simplify right side
   105,156.09x = 9,410,787,961.55
5. Step 5: Solve for x
   x = 9,410,787,961.55/105,156.09
6. Step 6: Final answer
   x = 89,493.51