Finding the Fourth Proportional to 31,056.78, 42,858.41 and 16,909.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,056.78 : 42,858.41 = 16,909.68 : x
2. Step 2: Convert to fraction form
   31,056.78/42,858.41 = 16,909.68/x
3. Step 3: Cross multiply
   31,056.78x = 42,858.41 × 16,909.68
4. Step 4: Simplify right side
   31,056.78x = 724,721,913.86
5. Step 5: Solve for x
   x = 724,721,913.86/31,056.78
6. Step 6: Final answer
   x = 23,335.38