Finding the Fourth Proportional to 100,685.70, 138,942.71 and 55,363.37

Step by Step Solution

1. Step 1: Write the proportion equation
   100,685.70 : 138,942.71 = 55,363.37 : x
2. Step 2: Convert to fraction form
   100,685.70/138,942.71 = 55,363.37/x
3. Step 3: Cross multiply
   100,685.70x = 138,942.71 × 55,363.37
4. Step 4: Simplify right side
   100,685.70x = 7,692,335,967.82
5. Step 5: Solve for x
   x = 7,692,335,967.82/100,685.70
6. Step 6: Final answer
   x = 76,399.49