Finding the Fourth Proportional to 8,978.06, 12,388.24 and 4,999.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.06 : 12,388.24 = 4,999.08 : x
2. Step 2: Convert to fraction form
   8,978.06/12,388.24 = 4,999.08/x
3. Step 3: Cross multiply
   8,978.06x = 12,388.24 × 4,999.08
4. Step 4: Simplify right side
   8,978.06x = 61,929,802.82
5. Step 5: Solve for x
   x = 61,929,802.82/8,978.06
6. Step 6: Final answer
   x = 6,897.90