Finding the Fourth Proportional to 265,558.56, 398,455.56 and 139,168.76

Step by Step Solution

1. Step 1: Write the proportion equation
   265,558.56 : 398,455.56 = 139,168.76 : x
2. Step 2: Convert to fraction form
   265,558.56/398,455.56 = 139,168.76/x
3. Step 3: Cross multiply
   265,558.56x = 398,455.56 × 139,168.76
4. Step 4: Simplify right side
   265,558.56x = 55,452,566,200.31
5. Step 5: Solve for x
   x = 55,452,566,200.31/265,558.56
6. Step 6: Final answer
   x = 208,814.83