Finding the Fourth Proportional to 99,965.95, 137,952.69 and 54,643.94

Step by Step Solution

1. Step 1: Write the proportion equation
   99,965.95 : 137,952.69 = 54,643.94 : x
2. Step 2: Convert to fraction form
   99,965.95/137,952.69 = 54,643.94/x
3. Step 3: Cross multiply
   99,965.95x = 137,952.69 × 54,643.94
4. Step 4: Simplify right side
   99,965.95x = 7,538,278,986.89
5. Step 5: Solve for x
   x = 7,538,278,986.89/99,965.95
6. Step 6: Final answer
   x = 75,408.47