Finding the Fourth Proportional to 204,978.80, 307,525.80 and 99,801.20

Step by Step Solution

1. Step 1: Write the proportion equation
   204,978.80 : 307,525.80 = 99,801.20 : x
2. Step 2: Convert to fraction form
   204,978.80/307,525.80 = 99,801.20/x
3. Step 3: Cross multiply
   204,978.80x = 307,525.80 × 99,801.20
4. Step 4: Simplify right side
   204,978.80x = 30,691,443,870.96
5. Step 5: Solve for x
   x = 30,691,443,870.96/204,978.80
6. Step 6: Final answer
   x = 149,729.84