Finding the Fourth Proportional to 9,513.77, 13,128.95 and 5,479.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,513.77 : 13,128.95 = 5,479.12 : x
2. Step 2: Convert to fraction form
   9,513.77/13,128.95 = 5,479.12/x
3. Step 3: Cross multiply
   9,513.77x = 13,128.95 × 5,479.12
4. Step 4: Simplify right side
   9,513.77x = 71,935,092.52
5. Step 5: Solve for x
   x = 71,935,092.52/9,513.77
6. Step 6: Final answer
   x = 7,561.16