Finding the Fourth Proportional to 265,561.77, 398,460.42 and 139,171.98

Step by Step Solution

1. Step 1: Write the proportion equation
   265,561.77 : 398,460.42 = 139,171.98 : x
2. Step 2: Convert to fraction form
   265,561.77/398,460.42 = 139,171.98/x
3. Step 3: Cross multiply
   265,561.77x = 398,460.42 × 139,171.98
4. Step 4: Simplify right side
   265,561.77x = 55,454,525,603.03
5. Step 5: Solve for x
   x = 55,454,525,603.03/265,561.77
6. Step 6: Final answer
   x = 208,819.69