Finding the Fourth Proportional to 8,064.58, 12,091.70 and 3,128.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,064.58 : 12,091.70 = 3,128.96 : x
2. Step 2: Convert to fraction form
   8,064.58/12,091.70 = 3,128.96/x
3. Step 3: Cross multiply
   8,064.58x = 12,091.70 × 3,128.96
4. Step 4: Simplify right side
   8,064.58x = 37,834,393.00
5. Step 5: Solve for x
   x = 37,834,393.00/8,064.58
6. Step 6: Final answer
   x = 4,691.43