Finding the Fourth Proportional to 31,071.60, 42,861.96 and 18,493.92

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.60 : 42,861.96 = 18,493.92 : x
2. Step 2: Convert to fraction form
   31,071.60/42,861.96 = 18,493.92/x
3. Step 3: Cross multiply
   31,071.60x = 42,861.96 × 18,493.92
4. Step 4: Simplify right side
   31,071.60x = 792,685,659.28
5. Step 5: Solve for x
   x = 792,685,659.28/31,071.60
6. Step 6: Final answer
   x = 25,511.58