Finding the Fourth Proportional to 103,404.30, 155,142.90 and 99,759.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,404.30 : 155,142.90 = 99,759.30 : x
2. Step 2: Convert to fraction form
   103,404.30/155,142.90 = 99,759.30/x
3. Step 3: Cross multiply
   103,404.30x = 155,142.90 × 99,759.30
4. Step 4: Simplify right side
   103,404.30x = 15,476,947,103.97
5. Step 5: Solve for x
   x = 15,476,947,103.97/103,404.30
6. Step 6: Final answer
   x = 149,674.12