Finding the Fourth Proportional to 11,212.51, 16,820.61 and 3,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,212.51 : 16,820.61 = 3,419.50 : x
2. Step 2: Convert to fraction form
   11,212.51/16,820.61 = 3,419.50/x
3. Step 3: Cross multiply
   11,212.51x = 16,820.61 × 3,419.50
4. Step 4: Simplify right side
   11,212.51x = 57,518,075.90
5. Step 5: Solve for x
   x = 57,518,075.90/11,212.51
6. Step 6: Final answer
   x = 5,129.81