Finding the Fourth Proportional to 8,978.32, 12,389.97 and 4,999.33

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.32 : 12,389.97 = 4,999.33 : x
2. Step 2: Convert to fraction form
   8,978.32/12,389.97 = 4,999.33/x
3. Step 3: Cross multiply
   8,978.32x = 12,389.97 × 4,999.33
4. Step 4: Simplify right side
   8,978.32x = 61,941,548.72
5. Step 5: Solve for x
   x = 61,941,548.72/8,978.32
6. Step 6: Final answer
   x = 6,899.01