Finding the Fourth Proportional to 265,472.86, 397,998.78 and 139,088.86

Step by Step Solution

1. Step 1: Write the proportion equation
   265,472.86 : 397,998.78 = 139,088.86 : x
2. Step 2: Convert to fraction form
   265,472.86/397,998.78 = 139,088.86/x
3. Step 3: Cross multiply
   265,472.86x = 397,998.78 × 139,088.86
4. Step 4: Simplify right side
   265,472.86x = 55,357,196,591.59
5. Step 5: Solve for x
   x = 55,357,196,591.59/265,472.86
6. Step 6: Final answer
   x = 208,523.00