Finding the Fourth Proportional to 31,003.19, 42,784.18 and 16,856.03

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.19 : 42,784.18 = 16,856.03 : x
2. Step 2: Convert to fraction form
   31,003.19/42,784.18 = 16,856.03/x
3. Step 3: Cross multiply
   31,003.19x = 42,784.18 × 16,856.03
4. Step 4: Simplify right side
   31,003.19x = 721,171,421.61
5. Step 5: Solve for x
   x = 721,171,421.61/31,003.19
6. Step 6: Final answer
   x = 23,261.20