Finding the Fourth Proportional to 9,897.76, 13,659.56 and 5,706.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,897.76 : 13,659.56 = 5,706.28 : x
2. Step 2: Convert to fraction form
   9,897.76/13,659.56 = 5,706.28/x
3. Step 3: Cross multiply
   9,897.76x = 13,659.56 × 5,706.28
4. Step 4: Simplify right side
   9,897.76x = 77,945,274.04
5. Step 5: Solve for x
   x = 77,945,274.04/9,897.76
6. Step 6: Final answer
   x = 7,875.04