Finding the Fourth Proportional to 13,111.20, 19,666.56 and 3,250.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.20 : 19,666.56 = 3,250.50 : x
2. Step 2: Convert to fraction form
   13,111.20/19,666.56 = 3,250.50/x
3. Step 3: Cross multiply
   13,111.20x = 19,666.56 × 3,250.50
4. Step 4: Simplify right side
   13,111.20x = 63,926,153.28
5. Step 5: Solve for x
   x = 63,926,153.28/13,111.20
6. Step 6: Final answer
   x = 4,875.69