Finding the Fourth Proportional to 9,810.56, 13,539.80 and 5,618.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,810.56 : 13,539.80 = 5,618.81 : x
2. Step 2: Convert to fraction form
   9,810.56/13,539.80 = 5,618.81/x
3. Step 3: Cross multiply
   9,810.56x = 13,539.80 × 5,618.81
4. Step 4: Simplify right side
   9,810.56x = 76,077,611.53
5. Step 5: Solve for x
   x = 76,077,611.53/9,810.56
6. Step 6: Final answer
   x = 7,754.66