Finding the Fourth Proportional to 9,978.18, 14,973.08 and 5,539.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.18 : 14,973.08 = 5,539.56 : x
2. Step 2: Convert to fraction form
   9,978.18/14,973.08 = 5,539.56/x
3. Step 3: Cross multiply
   9,978.18x = 14,973.08 × 5,539.56
4. Step 4: Simplify right side
   9,978.18x = 82,944,288.89
5. Step 5: Solve for x
   x = 82,944,288.89/9,978.18
6. Step 6: Final answer
   x = 8,312.57