Finding the Fourth Proportional to 9,810.78, 13,538.88 and 5,562.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,810.78 : 13,538.88 = 5,562.12 : x
2. Step 2: Convert to fraction form
   9,810.78/13,538.88 = 5,562.12/x
3. Step 3: Cross multiply
   9,810.78x = 13,538.88 × 5,562.12
4. Step 4: Simplify right side
   9,810.78x = 75,304,875.23
5. Step 5: Solve for x
   x = 75,304,875.23/9,810.78
6. Step 6: Final answer
   x = 7,675.73