Finding the Fourth Proportional to 9,978.56, 14,973.65 and 5,539.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.56 : 14,973.65 = 5,539.94 : x
2. Step 2: Convert to fraction form
   9,978.56/14,973.65 = 5,539.94/x
3. Step 3: Cross multiply
   9,978.56x = 14,973.65 × 5,539.94
4. Step 4: Simplify right side
   9,978.56x = 82,953,020.01
5. Step 5: Solve for x
   x = 82,953,020.01/9,978.56
6. Step 6: Final answer
   x = 8,313.13