Finding the Fourth Proportional to 8,748.12, 12,071.52 and 5,390.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,748.12 : 12,071.52 = 5,390.40 : x
2. Step 2: Convert to fraction form
   8,748.12/12,071.52 = 5,390.40/x
3. Step 3: Cross multiply
   8,748.12x = 12,071.52 × 5,390.40
4. Step 4: Simplify right side
   8,748.12x = 65,070,321.41
5. Step 5: Solve for x
   x = 65,070,321.41/8,748.12
6. Step 6: Final answer
   x = 7,438.21