Finding the Fourth Proportional to 100,917, 139,265.46 and 56,205

Step by Step Solution

1. Step 1: Write the proportion equation
   100,917 : 139,265.46 = 56,205 : x
2. Step 2: Convert to fraction form
   100,917/139,265.46 = 56,205/x
3. Step 3: Cross multiply
   100,917x = 139,265.46 × 56,205
4. Step 4: Simplify right side
   100,917x = 7,827,415,179.30
5. Step 5: Solve for x
   x = 7,827,415,179.30/100,917
6. Step 6: Final answer
   x = 77,562.90