Finding the Fourth Proportional to 99,429.38, 137,212.56 and 54,717.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,429.38 : 137,212.56 = 54,717.38 : x
2. Step 2: Convert to fraction form
   99,429.38/137,212.56 = 54,717.38/x
3. Step 3: Cross multiply
   99,429.38x = 137,212.56 × 54,717.38
4. Step 4: Simplify right side
   99,429.38x = 7,507,911,100.23
5. Step 5: Solve for x
   x = 7,507,911,100.23/99,429.38
6. Step 6: Final answer
   x = 75,509.99