Finding the Fourth Proportional to 100,838.31, 139,160.06 and 54,901.05

Step by Step Solution

1. Step 1: Write the proportion equation
   100,838.31 : 139,160.06 = 54,901.05 : x
2. Step 2: Convert to fraction form
   100,838.31/139,160.06 = 54,901.05/x
3. Step 3: Cross multiply
   100,838.31x = 139,160.06 × 54,901.05
4. Step 4: Simplify right side
   100,838.31x = 7,640,033,412.06
5. Step 5: Solve for x
   x = 7,640,033,412.06/100,838.31
6. Step 6: Final answer
   x = 75,765.19