Finding the Fourth Proportional to 11,920.79, 17,870.56 and 4,520.23

Step by Step Solution

1. Step 1: Write the proportion equation
   11,920.79 : 17,870.56 = 4,520.23 : x
2. Step 2: Convert to fraction form
   11,920.79/17,870.56 = 4,520.23/x
3. Step 3: Cross multiply
   11,920.79x = 17,870.56 × 4,520.23
4. Step 4: Simplify right side
   11,920.79x = 80,778,985.45
5. Step 5: Solve for x
   x = 80,778,985.45/11,920.79
6. Step 6: Final answer
   x = 6,776.31