Finding the Fourth Proportional to 99,401.25, 137,173.74 and 54,689.25

Step by Step Solution

1. Step 1: Write the proportion equation
   99,401.25 : 137,173.74 = 54,689.25 : x
2. Step 2: Convert to fraction form
   99,401.25/137,173.74 = 54,689.25/x
3. Step 3: Cross multiply
   99,401.25x = 137,173.74 × 54,689.25
4. Step 4: Simplify right side
   99,401.25x = 7,501,928,960.30
5. Step 5: Solve for x
   x = 7,501,928,960.30/99,401.25
6. Step 6: Final answer
   x = 75,471.17