Finding the Fourth Proportional to 8,978.17, 12,390.24 and 4,999.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.17 : 12,390.24 = 4,999.03 : x
2. Step 2: Convert to fraction form
   8,978.17/12,390.24 = 4,999.03/x
3. Step 3: Cross multiply
   8,978.17x = 12,390.24 × 4,999.03
4. Step 4: Simplify right side
   8,978.17x = 61,939,181.47
5. Step 5: Solve for x
   x = 61,939,181.47/8,978.17
6. Step 6: Final answer
   x = 6,898.86