Finding the Fourth Proportional to 391,931.31, 540,870.96 and 219,887.31

Step by Step Solution

1. Step 1: Write the proportion equation
   391,931.31 : 540,870.96 = 219,887.31 : x
2. Step 2: Convert to fraction form
   391,931.31/540,870.96 = 219,887.31/x
3. Step 3: Cross multiply
   391,931.31x = 540,870.96 × 219,887.31
4. Step 4: Simplify right side
   391,931.31x = 118,930,660,451.52
5. Step 5: Solve for x
   x = 118,930,660,451.52/391,931.31
6. Step 6: Final answer
   x = 303,447.71