Finding the Fourth Proportional to 31,003.68, 42,784.87 and 16,856.53

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.68 : 42,784.87 = 16,856.53 : x
2. Step 2: Convert to fraction form
   31,003.68/42,784.87 = 16,856.53/x
3. Step 3: Cross multiply
   31,003.68x = 42,784.87 × 16,856.53
4. Step 4: Simplify right side
   31,003.68x = 721,204,444.70
5. Step 5: Solve for x
   x = 721,204,444.70/31,003.68
6. Step 6: Final answer
   x = 23,261.90