Finding the Fourth Proportional to 11,389.50, 17,071.47 and 8,607.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,389.50 : 17,071.47 = 8,607.15 : x
2. Step 2: Convert to fraction form
   11,389.50/17,071.47 = 8,607.15/x
3. Step 3: Cross multiply
   11,389.50x = 17,071.47 × 8,607.15
4. Step 4: Simplify right side
   11,389.50x = 146,936,703.01
5. Step 5: Solve for x
   x = 146,936,703.01/11,389.50
6. Step 6: Final answer
   x = 12,901.07