Finding the Fourth Proportional to 100,909, 139,258.74 and 56,197

Step by Step Solution

1. Step 1: Write the proportion equation
   100,909 : 139,258.74 = 56,197 : x
2. Step 2: Convert to fraction form
   100,909/139,258.74 = 56,197/x
3. Step 3: Cross multiply
   100,909x = 139,258.74 × 56,197
4. Step 4: Simplify right side
   100,909x = 7,825,923,411.78
5. Step 5: Solve for x
   x = 7,825,923,411.78/100,909
6. Step 6: Final answer
   x = 77,554.27