Finding the Fourth Proportional to 11,669.16, 17,499.19 and 5,428.01

Step by Step Solution

1. Step 1: Write the proportion equation
   11,669.16 : 17,499.19 = 5,428.01 : x
2. Step 2: Convert to fraction form
   11,669.16/17,499.19 = 5,428.01/x
3. Step 3: Cross multiply
   11,669.16x = 17,499.19 × 5,428.01
4. Step 4: Simplify right side
   11,669.16x = 94,985,818.67
5. Step 5: Solve for x
   x = 94,985,818.67/11,669.16
6. Step 6: Final answer
   x = 8,139.90