Finding the Fourth Proportional to 11,980.77, 17,972.23 and 3,215.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,980.77 : 17,972.23 = 3,215.62 : x
2. Step 2: Convert to fraction form
   11,980.77/17,972.23 = 3,215.62/x
3. Step 3: Cross multiply
   11,980.77x = 17,972.23 × 3,215.62
4. Step 4: Simplify right side
   11,980.77x = 57,791,888.72
5. Step 5: Solve for x
   x = 57,791,888.72/11,980.77
6. Step 6: Final answer
   x = 4,823.72