Finding the Fourth Proportional to 100,317.89, 138,437.81 and 54,995.05

Step by Step Solution

1. Step 1: Write the proportion equation
   100,317.89 : 138,437.81 = 54,995.05 : x
2. Step 2: Convert to fraction form
   100,317.89/138,437.81 = 54,995.05/x
3. Step 3: Cross multiply
   100,317.89x = 138,437.81 × 54,995.05
4. Step 4: Simplify right side
   100,317.89x = 7,613,394,387.14
5. Step 5: Solve for x
   x = 7,613,394,387.14/100,317.89
6. Step 6: Final answer
   x = 75,892.69