Finding the Fourth Proportional to 9,051.02, 12,489.81 and 5,072.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,051.02 : 12,489.81 = 5,072.12 : x
2. Step 2: Convert to fraction form
   9,051.02/12,489.81 = 5,072.12/x
3. Step 3: Cross multiply
   9,051.02x = 12,489.81 × 5,072.12
4. Step 4: Simplify right side
   9,051.02x = 63,349,815.10
5. Step 5: Solve for x
   x = 63,349,815.10/9,051.02
6. Step 6: Final answer
   x = 6,999.19