Finding the Fourth Proportional to 22,947.57, 31,667.85 and 12,876.21

Step by Step Solution

1. Step 1: Write the proportion equation
   22,947.57 : 31,667.85 = 12,876.21 : x
2. Step 2: Convert to fraction form
   22,947.57/31,667.85 = 12,876.21/x
3. Step 3: Cross multiply
   22,947.57x = 31,667.85 × 12,876.21
4. Step 4: Simplify right side
   22,947.57x = 407,761,886.85
5. Step 5: Solve for x
   x = 407,761,886.85/22,947.57
6. Step 6: Final answer
   x = 17,769.28