Finding the Fourth Proportional to 9,051.74, 12,490.72 and 5,072.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,051.74 : 12,490.72 = 5,072.09 : x
2. Step 2: Convert to fraction form
   9,051.74/12,490.72 = 5,072.09/x
3. Step 3: Cross multiply
   9,051.74x = 12,490.72 × 5,072.09
4. Step 4: Simplify right side
   9,051.74x = 63,353,980.87
5. Step 5: Solve for x
   x = 63,353,980.87/9,051.74
6. Step 6: Final answer
   x = 6,999.09