Finding the Fourth Proportional to 22,970.35, 31,696.72 and 12,899.91

Step by Step Solution

1. Step 1: Write the proportion equation
   22,970.35 : 31,696.72 = 12,899.91 : x
2. Step 2: Convert to fraction form
   22,970.35/31,696.72 = 12,899.91/x
3. Step 3: Cross multiply
   22,970.35x = 31,696.72 × 12,899.91
4. Step 4: Simplify right side
   22,970.35x = 408,884,835.30
5. Step 5: Solve for x
   x = 408,884,835.30/22,970.35
6. Step 6: Final answer
   x = 17,800.55