Finding the Fourth Proportional to 100,387.38, 138,536.28 and 55,069.50

Step by Step Solution

1. Step 1: Write the proportion equation
   100,387.38 : 138,536.28 = 55,069.50 : x
2. Step 2: Convert to fraction form
   100,387.38/138,536.28 = 55,069.50/x
3. Step 3: Cross multiply
   100,387.38x = 138,536.28 × 55,069.50
4. Step 4: Simplify right side
   100,387.38x = 7,629,123,671.46
5. Step 5: Solve for x
   x = 7,629,123,671.46/100,387.38
6. Step 6: Final answer
   x = 75,996.84