Finding the Fourth Proportional to 11,430.91, 17,139.45 and 7,477.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,430.91 : 17,139.45 = 7,477.42 : x
2. Step 2: Convert to fraction form
   11,430.91/17,139.45 = 7,477.42/x
3. Step 3: Cross multiply
   11,430.91x = 17,139.45 × 7,477.42
4. Step 4: Simplify right side
   11,430.91x = 128,158,866.22
5. Step 5: Solve for x
   x = 128,158,866.22/11,430.91
6. Step 6: Final answer
   x = 11,211.61