Finding the Fourth Proportional to 99,280.21, 137,007.59 and 53,958.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,280.21 : 137,007.59 = 53,958.31 : x
2. Step 2: Convert to fraction form
   99,280.21/137,007.59 = 53,958.31/x
3. Step 3: Cross multiply
   99,280.21x = 137,007.59 × 53,958.31
4. Step 4: Simplify right side
   99,280.21x = 7,392,698,013.57
5. Step 5: Solve for x
   x = 7,392,698,013.57/99,280.21
6. Step 6: Final answer
   x = 74,462.96