Finding the Fourth Proportional to 518,747.82, 778,056.12 and 139,698.81

Step by Step Solution

1. Step 1: Write the proportion equation
   518,747.82 : 778,056.12 = 139,698.81 : x
2. Step 2: Convert to fraction form
   518,747.82/778,056.12 = 139,698.81/x
3. Step 3: Cross multiply
   518,747.82x = 778,056.12 × 139,698.81
4. Step 4: Simplify right side
   518,747.82x = 108,693,514,077.22
5. Step 5: Solve for x
   x = 108,693,514,077.22/518,747.82
6. Step 6: Final answer
   x = 209,530.55