Finding the Fourth Proportional to 293,498.91, 440,144.67 and 139,606.78

Step by Step Solution

1. Step 1: Write the proportion equation
   293,498.91 : 440,144.67 = 139,606.78 : x
2. Step 2: Convert to fraction form
   293,498.91/440,144.67 = 139,606.78/x
3. Step 3: Cross multiply
   293,498.91x = 440,144.67 × 139,606.78
4. Step 4: Simplify right side
   293,498.91x = 61,447,180,112.86
5. Step 5: Solve for x
   x = 61,447,180,112.86/293,498.91
6. Step 6: Final answer
   x = 209,360.85