Finding the Fourth Proportional to 445,111.02, 613,918.35 and 309,145.14

Step by Step Solution

1. Step 1: Write the proportion equation
   445,111.02 : 613,918.35 = 309,145.14 : x
2. Step 2: Convert to fraction form
   445,111.02/613,918.35 = 309,145.14/x
3. Step 3: Cross multiply
   445,111.02x = 613,918.35 × 309,145.14
4. Step 4: Simplify right side
   445,111.02x = 189,789,874,259.32
5. Step 5: Solve for x
   x = 189,789,874,259.32/445,111.02
6. Step 6: Final answer
   x = 426,387.72