Finding the Fourth Proportional to 259,639.17, 389,499.76 and 109,880.25

Step by Step Solution

1. Step 1: Write the proportion equation
   259,639.17 : 389,499.76 = 109,880.25 : x
2. Step 2: Convert to fraction form
   259,639.17/389,499.76 = 109,880.25/x
3. Step 3: Cross multiply
   259,639.17x = 389,499.76 × 109,880.25
4. Step 4: Simplify right side
   259,639.17x = 42,798,329,193.59
5. Step 5: Solve for x
   x = 42,798,329,193.59/259,639.17
6. Step 6: Final answer
   x = 164,837.72