Finding the Fourth Proportional to 305,298.88, 421,036.81 and 190,588.10

Step by Step Solution

1. Step 1: Write the proportion equation
   305,298.88 : 421,036.81 = 190,588.10 : x
2. Step 2: Convert to fraction form
   305,298.88/421,036.81 = 190,588.10/x
3. Step 3: Cross multiply
   305,298.88x = 421,036.81 × 190,588.10
4. Step 4: Simplify right side
   305,298.88x = 80,244,603,066.31
5. Step 5: Solve for x
   x = 80,244,603,066.31/305,298.88
6. Step 6: Final answer
   x = 262,839.50