Finding the Fourth Proportional to 8,978.14, 12,389.91 and 4,999.62

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.14 : 12,389.91 = 4,999.62 : x
2. Step 2: Convert to fraction form
   8,978.14/12,389.91 = 4,999.62/x
3. Step 3: Cross multiply
   8,978.14x = 12,389.91 × 4,999.62
4. Step 4: Simplify right side
   8,978.14x = 61,944,897.67
5. Step 5: Solve for x
   x = 61,944,897.67/8,978.14
6. Step 6: Final answer
   x = 6,899.52