Finding the Fourth Proportional to 105,140.95, 145,093.50 and 64,838.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105,140.95 : 145,093.50 = 64,838.59 : x
2. Step 2: Convert to fraction form
   105,140.95/145,093.50 = 64,838.59/x
3. Step 3: Cross multiply
   105,140.95x = 145,093.50 × 64,838.59
4. Step 4: Simplify right side
   105,140.95x = 9,407,657,958.17
5. Step 5: Solve for x
   x = 9,407,657,958.17/105,140.95
6. Step 6: Final answer
   x = 89,476.63