Finding the Fourth Proportional to 259,710.93, 389,588.61 and 91,216.59

Step by Step Solution

1. Step 1: Write the proportion equation
   259,710.93 : 389,588.61 = 91,216.59 : x
2. Step 2: Convert to fraction form
   259,710.93/389,588.61 = 91,216.59/x
3. Step 3: Cross multiply
   259,710.93x = 389,588.61 × 91,216.59
4. Step 4: Simplify right side
   259,710.93x = 35,536,944,507.04
5. Step 5: Solve for x
   x = 35,536,944,507.04/259,710.93
6. Step 6: Final answer
   x = 136,832.69