Finding the Fourth Proportional to 7,700.88, 10,698.90 and 7,608.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,700.88 : 10,698.90 = 7,608.72 : x
2. Step 2: Convert to fraction form
   7,700.88/10,698.90 = 7,608.72/x
3. Step 3: Cross multiply
   7,700.88x = 10,698.90 × 7,608.72
4. Step 4: Simplify right side
   7,700.88x = 81,404,934.41
5. Step 5: Solve for x
   x = 81,404,934.41/7,700.88
6. Step 6: Final answer
   x = 10,570.86