Finding the Fourth Proportional to 8,505.52, 12,760.70 and 3,312.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,505.52 : 12,760.70 = 3,312.88 : x
2. Step 2: Convert to fraction form
   8,505.52/12,760.70 = 3,312.88/x
3. Step 3: Cross multiply
   8,505.52x = 12,760.70 × 3,312.88
4. Step 4: Simplify right side
   8,505.52x = 42,274,667.82
5. Step 5: Solve for x
   x = 42,274,667.82/8,505.52
6. Step 6: Final answer
   x = 4,970.26