Finding the Fourth Proportional to 23,045.50, 31,800.90 and 12,970.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,045.50 : 31,800.90 = 12,970.72 : x
2. Step 2: Convert to fraction form
   23,045.50/31,800.90 = 12,970.72/x
3. Step 3: Cross multiply
   23,045.50x = 31,800.90 × 12,970.72
4. Step 4: Simplify right side
   23,045.50x = 412,480,569.65
5. Step 5: Solve for x
   x = 412,480,569.65/23,045.50
6. Step 6: Final answer
   x = 17,898.53