Finding the Fourth Proportional to 8,978.32, 12,388.58 and 4,999.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.32 : 12,388.58 = 4,999.32 : x
2. Step 2: Convert to fraction form
   8,978.32/12,388.58 = 4,999.32/x
3. Step 3: Cross multiply
   8,978.32x = 12,388.58 × 4,999.32
4. Step 4: Simplify right side
   8,978.32x = 61,934,475.77
5. Step 5: Solve for x
   x = 61,934,475.77/8,978.32
6. Step 6: Final answer
   x = 6,898.23