Finding the Fourth Proportional to 9,051.31, 12,491.51 and 5,072.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,051.31 : 12,491.51 = 5,072.79 : x
2. Step 2: Convert to fraction form
   9,051.31/12,491.51 = 5,072.79/x
3. Step 3: Cross multiply
   9,051.31x = 12,491.51 × 5,072.79
4. Step 4: Simplify right side
   9,051.31x = 63,366,781.65
5. Step 5: Solve for x
   x = 63,366,781.65/9,051.31
6. Step 6: Final answer
   x = 7,000.84