Finding the Fourth Proportional to 7,759.18, 10,637.86 and 7,618.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,759.18 : 10,637.86 = 7,618.78 : x
2. Step 2: Convert to fraction form
   7,759.18/10,637.86 = 7,618.78/x
3. Step 3: Cross multiply
   7,759.18x = 10,637.86 × 7,618.78
4. Step 4: Simplify right side
   7,759.18x = 81,047,515.01
5. Step 5: Solve for x
   x = 81,047,515.01/7,759.18
6. Step 6: Final answer
   x = 10,445.37