Finding the Fourth Proportional to 99,145.50, 136,822.95 and 54,433.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,145.50 : 136,822.95 = 54,433.50 : x
2. Step 2: Convert to fraction form
   99,145.50/136,822.95 = 54,433.50/x
3. Step 3: Cross multiply
   99,145.50x = 136,822.95 × 54,433.50
4. Step 4: Simplify right side
   99,145.50x = 7,447,752,048.83
5. Step 5: Solve for x
   x = 7,447,752,048.83/99,145.50
6. Step 6: Final answer
   x = 75,119.42