Finding the Fourth Proportional to 105,141.96, 145,094.88 and 64,839.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,141.96 : 145,094.88 = 64,839.60 : x
2. Step 2: Convert to fraction form
   105,141.96/145,094.88 = 64,839.60/x
3. Step 3: Cross multiply
   105,141.96x = 145,094.88 × 64,839.60
4. Step 4: Simplify right side
   105,141.96x = 9,407,893,981.25
5. Step 5: Solve for x
   x = 9,407,893,981.25/105,141.96
6. Step 6: Final answer
   x = 89,478.02