Finding the Fourth Proportional to 259,690.25, 389,557.71 and 91,196.12

Step by Step Solution

1. Step 1: Write the proportion equation
   259,690.25 : 389,557.71 = 91,196.12 : x
2. Step 2: Convert to fraction form
   259,690.25/389,557.71 = 91,196.12/x
3. Step 3: Cross multiply
   259,690.25x = 389,557.71 × 91,196.12
4. Step 4: Simplify right side
   259,690.25x = 35,526,149,720.30
5. Step 5: Solve for x
   x = 35,526,149,720.30/259,690.25
6. Step 6: Final answer
   x = 136,802.02