Finding the Fourth Proportional to 13,222.50, 19,837.05 and 3,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,222.50 : 19,837.05 = 3,988.50 : x
2. Step 2: Convert to fraction form
   13,222.50/19,837.05 = 3,988.50/x
3. Step 3: Cross multiply
   13,222.50x = 19,837.05 × 3,988.50
4. Step 4: Simplify right side
   13,222.50x = 79,120,073.93
5. Step 5: Solve for x
   x = 79,120,073.93/13,222.50
6. Step 6: Final answer
   x = 5,983.75