Finding the Fourth Proportional to 10,521.34, 15,760.67 and 4,891.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.34 : 15,760.67 = 4,891.12 : x
2. Step 2: Convert to fraction form
   10,521.34/15,760.67 = 4,891.12/x
3. Step 3: Cross multiply
   10,521.34x = 15,760.67 × 4,891.12
4. Step 4: Simplify right side
   10,521.34x = 77,087,328.25
5. Step 5: Solve for x
   x = 77,087,328.25/10,521.34
6. Step 6: Final answer
   x = 7,326.76