Finding the Fourth Proportional to 100,917.25, 139,265.81 and 56,205.25

Step by Step Solution

1. Step 1: Write the proportion equation
   100,917.25 : 139,265.81 = 56,205.25 : x
2. Step 2: Convert to fraction form
   100,917.25/139,265.81 = 56,205.25/x
3. Step 3: Cross multiply
   100,917.25x = 139,265.81 × 56,205.25
4. Step 4: Simplify right side
   100,917.25x = 7,827,469,667.50
5. Step 5: Solve for x
   x = 7,827,469,667.50/100,917.25
6. Step 6: Final answer
   x = 77,563.25