Finding the Fourth Proportional to 659,456.01, 988,667.25 and 260,395.49

Step by Step Solution

1. Step 1: Write the proportion equation
   659,456.01 : 988,667.25 = 260,395.49 : x
2. Step 2: Convert to fraction form
   659,456.01/988,667.25 = 260,395.49/x
3. Step 3: Cross multiply
   659,456.01x = 988,667.25 × 260,395.49
4. Step 4: Simplify right side
   659,456.01x = 257,444,488,067.37
5. Step 5: Solve for x
   x = 257,444,488,067.37/659,456.01
6. Step 6: Final answer
   x = 390,389.18