Finding the Fourth Proportional to 105,117.72, 145,097.64 and 64,813.74

Step by Step Solution

1. Step 1: Write the proportion equation
   105,117.72 : 145,097.64 = 64,813.74 : x
2. Step 2: Convert to fraction form
   105,117.72/145,097.64 = 64,813.74/x
3. Step 3: Cross multiply
   105,117.72x = 145,097.64 × 64,813.74
4. Step 4: Simplify right side
   105,117.72x = 9,404,320,713.57
5. Step 5: Solve for x
   x = 9,404,320,713.57/105,117.72
6. Step 6: Final answer
   x = 89,464.66