Finding the Fourth Proportional to 31,886.91, 47,808.69 and 17,856.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,886.91 : 47,808.69 = 17,856.57 : x
2. Step 2: Convert to fraction form
   31,886.91/47,808.69 = 17,856.57/x
3. Step 3: Cross multiply
   31,886.91x = 47,808.69 × 17,856.57
4. Step 4: Simplify right side
   31,886.91x = 853,699,219.59
5. Step 5: Solve for x
   x = 853,699,219.59/31,886.91
6. Step 6: Final answer
   x = 26,772.72