Finding the Fourth Proportional to 12,978.48, 19,469.77 and 5,583.00

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.48 : 19,469.77 = 5,583.00 : x
2. Step 2: Convert to fraction form
   12,978.48/19,469.77 = 5,583.00/x
3. Step 3: Cross multiply
   12,978.48x = 19,469.77 × 5,583.00
4. Step 4: Simplify right side
   12,978.48x = 108,699,730.21
5. Step 5: Solve for x
   x = 108,699,730.21/12,978.48
6. Step 6: Final answer
   x = 8,375.38