Finding the Fourth Proportional to 11,164.07, 15,406.61 and 6,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,164.07 : 15,406.61 = 6,128.76 : x
2. Step 2: Convert to fraction form
   11,164.07/15,406.61 = 6,128.76/x
3. Step 3: Cross multiply
   11,164.07x = 15,406.61 × 6,128.76
4. Step 4: Simplify right side
   11,164.07x = 94,423,384.46
5. Step 5: Solve for x
   x = 94,423,384.46/11,164.07
6. Step 6: Final answer
   x = 8,457.80