Finding the Fourth Proportional to 409,061.28, 613,619.82 and 139,079.52

Step by Step Solution

1. Step 1: Write the proportion equation
   409,061.28 : 613,619.82 = 139,079.52 : x
2. Step 2: Convert to fraction form
   409,061.28/613,619.82 = 139,079.52/x
3. Step 3: Cross multiply
   409,061.28x = 613,619.82 × 139,079.52
4. Step 4: Simplify right side
   409,061.28x = 85,341,950,028.09
5. Step 5: Solve for x
   x = 85,341,950,028.09/409,061.28
6. Step 6: Final answer
   x = 208,628.77