Finding the Fourth Proportional to 8,745.12, 12,070.32 and 5,390.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,745.12 : 12,070.32 = 5,390.04 : x
2. Step 2: Convert to fraction form
   8,745.12/12,070.32 = 5,390.04/x
3. Step 3: Cross multiply
   8,745.12x = 12,070.32 × 5,390.04
4. Step 4: Simplify right side
   8,745.12x = 65,059,507.61
5. Step 5: Solve for x
   x = 65,059,507.61/8,745.12
6. Step 6: Final answer
   x = 7,439.52