Finding the Fourth Proportional to 100,389.05, 138,538.73 and 55,069.35

Step by Step Solution

1. Step 1: Write the proportion equation
   100,389.05 : 138,538.73 = 55,069.35 : x
2. Step 2: Convert to fraction form
   100,389.05/138,538.73 = 55,069.35/x
3. Step 3: Cross multiply
   100,389.05x = 138,538.73 × 55,069.35
4. Step 4: Simplify right side
   100,389.05x = 7,629,237,535.58
5. Step 5: Solve for x
   x = 7,629,237,535.58/100,389.05
6. Step 6: Final answer
   x = 75,996.71